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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56 BULLETIN 90, UNITED STATES NATIONAL MUSEUM. .<br />
TRIPHYLLOZOON, new genus.<br />
{Trlphyllon, trifoliate, alluding to the trifoliate ovicell.)<br />
" The ovicell has a ' trifoliate stigma.' There is generally a minute<br />
avicularium on the lip to one side. The opercula generally are fairly<br />
similar with a nearly straight proximal edge, and in shape rather<br />
wider than long, v^ ith the muscular attachments rather high up and<br />
near the border. Apparently all have the labial pore which is often<br />
the end of a long tube opening into the zocecium ( = ascopore) proxi-<br />
mally to the operculum" (Waters).<br />
Oenoti/pe.—Triphyllozoon {Retepora ) monUifenim ]Mac( Hlli vray,<br />
18G0. Eecent.<br />
Genus RHYNCHOZOON Hincks, 1891.<br />
1881. Rhi/nrhopora Hincks, British Marine Polyzoa. p. 38.5, (Preoccupied,<br />
replaced by Rhynchozoon in 1891.)<br />
" This genus seems to be characterized by the possession, of a more<br />
or less well-developed sinus on the apertura, by its ovicell which has<br />
an entire frontal surface, and is provided with an incomplete ooecial<br />
cover, and by the possession of pore-chambers (dietella?.)" (Levin-<br />
gen.)<br />
Genotype.—Rhynchozoon {LepraUa) hhpinosa Johnston, 1849.<br />
Eecent.<br />
Genus SCHIZOTHECA Hmcks, 1877.<br />
1877. ScMsotheca Hincks, On British Polyzoa, pt. 2, Classification, Annals<br />
Magazine Natural History (4), vol. 20. p. i"t28; 1880, British Marine<br />
Polyzoa, p. 283.<br />
" Zooecia with a suborbicular primary orifice, the lower margin<br />
sinuatecl; the secondary orifice raised, tubular, notched in front.<br />
Ovicell terminal, with a fissure in the front w'all, never closed by the<br />
operculum."<br />
Genotype.—Schizotheca {LepraUa) fissa Busk, 1856. Eecent.<br />
Levinsen classified this genus in the Eeteporidae, where we also<br />
believe it better placed.<br />
Family GALEOPSIDAE Jullien, 1903.<br />
The ovicell is hyperstomial and opens into the peristomie above<br />
the operculum. A spiramen introduces into the peristomie the wa-<br />
ter destined afterwards for the compensatrix.<br />
In the family of the Adeonidae as in that of the Eeteporidae this<br />
spiramen also exists; it is in evident relation Avith the hydrostatic<br />
system; it might have another use, another function mifortunately<br />
still unknown. It is not possible, for example, to compare the size<br />
of the spiramen of Galeopsis with the smallness of the orifice of the<br />
compensatrix simply closed by a rimule or by a poster of an oper-
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