110 
BULLETIN 125, UNITED STATES NATIONAL MUSEUM. 
Variations. —The rimule bears two salient condyles on which are supported 
the small proximal tongue of the operculum. The ovicell is globular, elongated, 
large; it bears in front a small concavity; it bears small tremopores like the frontal, 
it is closed by the operculum. 
The large avicularium is not median; it is eccentric and curved. 
The species which Miss Robertson has figured under the same name appears 
to be different for the apertura of the ovicelled zooecia is much larger than that 
of the ordinary zooecia. This is not the case in the figure of Hincks and of our 
specimen. 
Occurrence. —Pleistocene: Santa Barbara, California (rare). 
Habitat. —Queen Charlotte Islands. 
Plesiotype. —Cat. No. 68572, U.S.N.M. 
Genus GEMELLIPORELLA Canu and Bassler, 1920. 
1920. Gemelliporella Canu and Bassler, North American Early Tertiary Bryozoa, Bulletin 106, 
U. S. National Museum, p. 372. 
The ovicell is hyperstomial and deeply embedded in the distal zooecium. 
The operculum does not close the ovicell and operates in a locella. The form of 
the apertura is like a keyhole. The frontal is garnished with lateral areolar pores 
and with a granular pleurocyst. 
Genotype.—Gemelliporella vorax, new species. Range: Pliocene. 
The genus Gemellipora Smitt, 1872, founded solely on the aspect of the apertura, 
is not a natural one. The first species described, G. eburnea, has been selected by 
Levinsen, 1909, as the type of the genus and classified in his family Liriozoidae. 
Gemellipora striatula Smitt, 1872, is a synonym for Trypostega venusta Norman, 1869. 
Gemellipora glabra Smitt appears to have a smooth frontal, but it is necessary to 
examine specimens anew. G. limbata Smitt is serial and appears to belong to the 
Phylactellidae. The keyhole form of the aperture does not appear to furnish a 
sufficient generic character because it does not correspond to an important modifica¬ 
tion of the hydrostatic function. In establishing the new genus Gemelliporella we 
have employed the characters furnished by the ovicell and the frontal. 
GEMELLIPORELLA ASPER, new species. 
Plate 18, figs. 5, 6. 
Description. —The zoarium incrusts oysters. The zooecia are little distinct, 
irregularly elliptical; the frontal is small, hardly convex, surrounded by large, 
crowded, areolar pores. The apertura is deep, buried, elongate, shaped like a key¬ 
hole, with two lateral symmetrical condyles limiting the rimule; the peristomice 
is elliptical and bears a little salient mucro. The ovicell is globular, salient, punctate; 
its orifice is very large and can not be closed by the operculum. On each side of 
the apertura there are two large orbicular avicularia with pivot, very salient; the 
one between them is much developed and becomes onychocelliform; its pivot 
bears a wide rectangular denticle. 
Measurements. —Apertural^ a— j?' mm ' Zooecia!^ — 0.40-0.50 mm. 
r lla =0.10 mm. I lz = 0.30 mm. 
Affinities. —The avicularia by their saliency cover the zoarial surface with a 
great number of asperities which characterize this species, but which render it 
