History of British animals - University of Guam Marine Laboratory

Ampullama. MOLLUSCA. PECTINIBRANCHIA. 317ture suborbicular ; right lip enlarged— Sower. Min. Conch, t. cclxxxiv. twolower figures.— London Clay.4. A. ambulacrum Globose, with a canal round an acute spire ; pillar-cavityplain within Sower. Min. Conch, t. ccclxxii. — London Clay.5. A. nobilis Subglobose, smooth ; spire conical, composed of a few convexwhorls; base very convex; no pillar cavity; aperture 1.— elliptical, sublunate,pointed above.— Sower. Min. Conch, t. Dxxii. f. Carboniferous Limestone.6. A. helicoidis.—Almost discoid, smooth ; spire very short, blunt ; whorlsnearly blended, round ;base with a pillar cavity ; aperture oblong.— Sower.Min. Conch, t. Dxxii. f. 2.— Carboniferous Limestone, Ireland.7. A."canaliculata Ventricose, whorls three or four ; transversely andobliquely striated ; the strife decussating each other ; spire short ; turns ofthe spire separated by a deep channel."—ManU Geol. Suss. 87. t. xix. f. 13.Blue Chalk Marl.—Mr Mantell likewise refers another shell to this genus,but with " doubt, a subglobose, ventricose, univalve," p. 111. t. xviii. f. 11.Gen. MELANIA.— Shell turrited; aperture oblong; pillarlipsmooth, and bent in the middle.1. M. sulcata Spire more than five times the length of its diameter, withspiral striae ; a concave furrow between each whorl ; whorls fourteen— Sower.Min, Conch, t. xxxix. middle figure —London Clay, Stubbington Cliffs.2. M. Heddingtonensis A shell about three times as long as the diameter ;concave near the middle, with anwhorls eight or more, the surface of eachobtuse angled rising near the upper part.— Sower. Min. Conch, t. xxxix. rightand left hand figures.— Upper and Middle Oolite.3. M. striata Length two and a half times as long as the diameter ; whorlssix or more, with about sixteen rounded spiral ribs, nearly equal on the outerpart of the whorls, but widened on the concealed parts—Sower. Min. Conch,t. xlvii.— Lias.4. M. lineata Acuminated ; whorls nine, finely striated across ; apertureangular above—Sower. Min. Conch, t. ccxviii. 1.— f. Inferior Oolite, at Dundry.5. M./asciafo.—Turrited, short; whorls six, ovate.— spirally striated, marked withthree coloured bands, coronated; aperture Sower. Min. Conch, t.ecxli. f. 1.—Fresh-water Formation, Isle of Wight.6. M. costata.—Turrited, spirally striated, transversely ribbed ; mouth obovate.—Sower. Min. Conch, t. ccxli. f. 2—London Clay, Hordwell.7. M. minima Turrited, smooth ;sides straight ; mouth ovate, pointedabove ; base slightly produced —Sower. Min. Conch, t. ccxli. f. 3.—LondonClay, Brakenhurst, Hants.8. M. truncala Conical, elongated, smooth ;whorls angular below ; mouthovate, acute above, truncated below.— Sower. Min. Conch, t. ccxli. f. 4.— LondonClay, Brakenhurst.With the exception of M. fasciata, it is doubtful if any of the precedingspecies belong to the genus Melania. It is more probable that they are relatedto the marine Turbonidce.9. M. costellata.—Turrito-subulated spirally, with numerous longitudinalribs ; anteal lip with a canal in the inside.— Lam, Hist. Vert. vii. 543. {Bran*der, Foss. Hant. f. 21-)—ManU Geol. 269.