Bulletin - United States National Museum - Smithsonian Institution
Bulletin - United States National Museum - Smithsonian Institution
Bulletin - United States National Museum - Smithsonian Institution
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54 BULLETIN 90, UNITED STATES NATIONAL MUSEUM.<br />
formed of diagonal bars. The frontal is a tremocyst with tubules.<br />
Twenty tentacles.<br />
Genotype.—Porella {Millepora) cervkornis Pallas, 17GG.<br />
Range.—Lutecian-Eecent.<br />
This genus differs from BmUtina only in the calcification; the<br />
tremocyst replaces the pleurocyst. There are, however, some other<br />
secondary differences. The mandible of the avicularium is semi-<br />
circular; it is generally (but not universally) triangular in Smlttina.<br />
This is a prolific genus in the Early Tertiary of North America,<br />
15 new species being known, represented in most cases by abundant<br />
specimens.<br />
Genus UMBONULA Hincks, 1880.<br />
1S80. Umhonnla Hinck, British Marine Polyzoa, p. 316.<br />
There is neither lyrule nor cardelles. The apertura is suborbi-<br />
cular. The ovicell is hyperstomial and opens largely above the aper-<br />
tura. The frontal is a pleurocyst with costules surrounded by areo-<br />
lae. A prominent umbo immediately below the mouth, supporting<br />
an avicularium.<br />
Genotype.— Umhonula (Cellepora) verrvcosa Esper, 1791.<br />
Range.—Lutecian-Eecent. Eepresented by two species in the<br />
Vicksburgian of Alabama.<br />
Genus PHOCEANA Jullien, 1903.<br />
1903. riioceana Jullien, Bryozoaires provenaut des Campagnes de VHiron-<br />
dcUc, p. 107.<br />
The apertura is semicircular with poster slightly concave; it is<br />
deprived of cardelles and bears a pseudolyrule formed by the elevation<br />
of the peristomial wall. The operculum bears a chitinous mural<br />
rim incomplete at the level of the convexity of the upper border and<br />
little removed from the lateral borders.<br />
Genotype.—Phoceana columnaris Jullien, 1903.<br />
Range.—Jacksonian-Eecent.<br />
HIPPADENELLA, new genus.<br />
{Aden., gland.)<br />
The frontal is a pleurocyst surrounded by areola?. The apertura<br />
bears two cardelles. The mandibles have a lucida in the middle. The<br />
avicularian chamber shows a double glandlike body and the pro-<br />
toj^lasmic mass.<br />
Genotype.—Hippadenella (Flustra) margaritifera Quoy and Gaymard,<br />
1833. Eecent.<br />
It seems to us that it would be better to classify this genus in the<br />
Hippoporinae, although all the authors are agreed in considering
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