Bulletin - United States National Museum - Smithsonian Institution

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80 BULLETIN 91, UNITED STATES NATIONAL MUSEUM. size consecutively from the periphery to the umbilical chink. Aper- ture subquadrate; posterior angle obtuse; outer lip thin, showing the external sculpture within; columella short, very oblique, slightly revo- lute, provided with an obsolete fold at its insertion; parietal wall covered with a thin callus. The type and another specimen, Cat. No. 249701, U.S.N .M., come from Port Alfred (Coll. No. 973). The type has nine whorls and measures: Length, 4 mm.; diameter, 1 mm. Cat. No. 249699, U.S.N .M., contains two additional specimens from the same locality. (Coll. No. 971). TURBONILLA (PYRGISCUS) TINCTA Sowerby. Cat. No. 186844, U.S.N.M., contains three specimens from Port Alfred (Coll. No. 211). TURBONILLA (PYRGISCUS) MAIA, new species. Plate 14, fig. 3. Shell elongate-conic, milk white. Nuclear whorls very small, at least two having their axis at a right angle to that of the succeeding turns, in the first of which they are about one-third immersed. Post- nuclear whorls inflated, strongly rounded, marked by narrow scalari- form, slightly protractive axial ribs, of which 16 occur upon the first and second, 18 upon the third to sixth, 20 upon the seventh, and 26 upon the penultimate turn. Upon this they become inflated and somewhat irregular; intercostal spaces about twice, to two and one- half times, as wide as the ribs, marked by strongly incised, spiral lines, of which 5 occur upon the first and second, 6 upon the third, 7 upon the fourth, and 8 upon the fifth and sixth, 13 upon the seventh, while upon the penultimate turn they become exceedingly irregular, both as to width, number, and spacing. Sutures strongly constricted. Periphery of the last whorl inflated, well rounded. Base rather short, well rounded, narrowly umbilicated, marked by the feeble continua- tions of the axial ribs and numerous spiral striations. Aperture oval; posterior angle obtuse; outer lip thin; inner lip decidedly curved; slightly reflected, free ; parietal wall glazed with a thin callus. The type, Cat. No. 187049, U.S.N .M., comes from Port Alfred (Coll. No. 587). It has eight and one-half post-nuclear whorls, and measures: Length, 7.1 mm.; diameter, 2.3 mm. Two additional lots are in the collection of the U. S. <strong>National</strong> <strong>Museum</strong>, all from Port Alfred. Cat. No. 249698, one specimen (Coll. No. 970). Cat. No. 250373, the tip of a young specimen (Coll. No. 1246). TURBONILLA (PYRGISCUS) TEFUNTA, new species. Plate 15, fig. 2. Shell elongate-conic, milk white, with a narrow pale yellow band a little posterior to the middle on each whorl. Nuclear whorls decol- lated. Postnuclear whorls slightly rounded, feebly shouldered at the
SOUTH AFRICAN MARINE MOLLUSKS. 81 summit, marked by rather strong, somewhat curved, slightly protractive axial ribs, of which 16 occur upon the first, 18 upon the second, 20 upon the third to fifth, 22 upon the sixth, and 24 upon the penultimate turn. These ribs are about as wide as the spaces that separate them, and render the summit of the whorls crenulated. Intercostal spaces crossed by 14 slender spiral threads, of which the 9 above the suture are equal and equally spaced, while the 3 remaining ones near the summit are much closer spaced. Sutures strongly marked. Periphery of the last whorl well rounded. Base moderately long, well rounded, marked by the continuation of the axial ribs, which extend to the umbilical chink, and about 25 spiral lirations, which become more closely spaced and less strongly developed from the periphery to the umbilical area. The intercostal spaces at the periphery are free from spiral sculpture and cause this to appear as a series of broad, strongly impressed pits. Aperture oval; posterior angle obtuse; outer lip rather thick; inner lip curved and decidedly' reflected, provided with a fold at its insertion; parietal wall covered by a moderately thick callus. The type and another specimen, Cat. No. 249697, U.S.N.M., come from Port Alfred (Coll. No. 969). The type has eight postnuclear whorls, and measures: Length, 4.6 mm.; diameter, 1.3 mm. TURBONILLA (PYRGISCUS) APSA, new species. Plate 16, fig. 4. Shell elongate-conic, thin, semitranslucent, bluish white. Nuclear whorls at least two, rather large, depressed helicoid, well rounded, about half immersed in the first of the succeeding turns. Postnuclear whorls moderately well rounded, shouldered at the summit, which is slightly exserted, and marked by obsolete axial ribs which are best expressed on the early turns. Of these ribs about 18 are indicated upon the second, 22 upon the third and fourth, 28 upon the fifth, and 20 upon the sixth and penultimate turns. Intercostal spaces scarcely visible, the ribs appearing a little more opaque than the spaces between them. In addition to the axial sculpture, the whorls are marked between the sutures by about eleven slender spiral striations which are of somewhat varying strength and spacing, the region immediately below the summit being free of spiral sculpture. Sutures well impressed. Periphery well rounded. Base well rounded, marked by about 16 slender spiral lirations which are strongest near the periphery and grow weaker and closer spaced towards the umbilical chink, where they are very densely massed. Aperture oval ; posterior angle acute ; outer lip thin ; inner lip strongly curved, slightly reflected, provided with a weak fold at its insertion. Parietal wall covered with a thick callus which renders the peritreme almost complete.
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SMITHSONIAN INSTITUTION UNITED STAT
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ADVERTISEMENT. The scientific publi
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yj TABLE OF CONTENTS. Systematic li
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Vin Systematic list—Continued. TA
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X TABLE OF CONTENTS. Systematic lis
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XII Systematic list—Continued. TA
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LIST OF SPECIES COLLECTED BY LIEUT.
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SOUTH AFRICAN MARINE MOLLUSKS. 223
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383. Triphoris sabita Bartsch. 384.
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590. SOUTH AFRICAN MARINE MOLLUSKS.
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MOLLUSKS REPORTED FROM SOUTH AFRICA
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Cerithium rissoidea Sowerby. SOUTH
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Conusfulvus Sowerby, South Africa.
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Cypraea producta Gaakoin. SOUTH AFR
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SOUTH AFRICAN MARINE MOLLUSKS, 239
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Limopsis natalensis Krauss, Natal.
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SOUTH AFRICAN" MARINE MOLLUSKS. 247
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Purpura anaxares Duclos. SOUTH AFRI
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Terebra laevigata Gray. SOUTH AFRIC
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U. S. NATIONAL MUSEUM BULLETIN 91 P
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U. S. NATIONAL MUSEUM South African
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U. S. NATIONAL MUSEUM 5ULLETIN 91 P
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U. S. NATIONAL MUSEUM • 4 South A
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U, S. NATIONAL MUSEUM BULLETIN 91 P
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U. S. NATIONAL MUSEUM SULLETIN 91 P
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abbreviate, Desmoulea 52, 223 Venus
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Amphiperas smithi 96, 224 Amphipera
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INDEX. 273 Page. belaeformis Pleuro
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INDEX. 275 Page. capensis, Trochus
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Clionella bornii 18,221 confusa 15,
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Crepidula aculeata 136, 225 adspers
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INDEX. Dolabella rumphii scopula do
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INDEX. 283 Page. Felaniella alfrede
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INDEX. 285 Page. gryphina, Chama 19
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Lampusia murray i 240 langleyi, Col
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Margaritiphora 185 capensis 185, 22
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multicolor, Gibbula 158,226 multieo
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obeliscus, Mitra 243 Turbonilla 76
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INDEX. 295 Page. Phasianella elonga
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pyramidalis, Alectrion 52,222 Bucci
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INDEX. 299 Page. scitulus, Conus 23
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taeniata, Natica 245 taeniatum, Cer
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Triton vespaceum 254 Tritonalia 60
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vertebrata, Pleurotoma 248 vesicula
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