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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EAELY TERTIARY CHEILOSTOME BEYOZOA. 55<br />
the genotype as belonging to the genus Porella; we can not maintain<br />
it there, the frontal being a pleurocyst and the apertura bearing<br />
cardelles.<br />
Family RETEPORIDAE Smitt, 1867.<br />
The ovicell is hyperstomial, much immersed in the distal zoojcium<br />
it is largely open into the peristomie. The zoarium is generally<br />
reticulate ; the dorsal face presents some projections or vibices with-<br />
out connection with zooecia and contains interiorly some keno-<br />
zoa?cia (lacimae of Waters) more or less numerous and elongated.<br />
The reteporidan pore placed in front of the apertura is according<br />
to its situation an ascopore or a spiramen; 11 to 16 tentacles.<br />
Genus RETEPORA Imperato, 1859.<br />
1859. Retepora Imperato, Dell' historia naturale, book 28.<br />
" This gi'oup has a fissure in the ovicell. The proximal edge of the<br />
operculum is nearly straight, and very similar throughout this<br />
group; labial avicularia occur in some but not in all. The oral<br />
glands are very well developed" (Waters). The reteporidan pore<br />
is a spiramen.<br />
Genotype.—Retepora cellulosa Linnseus-Smitt, 1867.<br />
Range,—Jacksonian-Recent.<br />
HIPPELLOZOON, new genus.<br />
{Hippos^ horse, referring to the horseshoe shape of the apertura.)<br />
The ovicell is widely open. There is neither labial avicularium<br />
nor reteporidan pore. The operculum is contracted in the middle,<br />
having long bands at the sides for the muscular attachments; the<br />
proximal edge is not straight. The apertura has two cardelles.<br />
Genotype.—Hippellozoon {Retepora) novezelandiae Waters, 1894.<br />
Recent.<br />
SCHIZELLOZOON, new genus.<br />
(Schizos, slit).<br />
The ovicell is widely open and provided with a semicircular slit.<br />
It has neither labial avicularium nor reteporidan pore. The operculum<br />
has a broad thickened border; the proximal edge is not<br />
straight. The poster of the apertura bears a wide little deep sinus.<br />
Genotype.—&ch kellozoon {Retepora) imperati Busk, 1884. Recent.<br />
The spiramen (reteporidan pore of Waters) is replaced by a<br />
pseudospiramen which is a groove in the proximal lip of the peri-<br />
stomice.<br />
;