274 
BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 
The oral lamellae are analogous to those in the genus Chaperia where they 
serve for the insertion of opercular muscles. They are not constant in the large 
zooecia, where they are sometimes replaced by two lateral denticles. 
The orifice of the ovicell has much resemblance to that of avicularia, for it is 
often constricted by two lateral denticles. 
The frontal is an olocyst in which the elements are crowded and regularly 
disposed. The zooecial dimorphism is inexplicable. 
Occurrence. — Middle Jacksonian (Castle Hayne limestone) : Wilmington, 
North Carolina (common). 
Cotypes. — Cat. No. 64011, U.S.N.M. 
CELLARIA BIFACIATA, new species. 
Plate 40, figs. 14-17. 
Description. — The zoarium is articulated; the segments are cylindrical and 
unsymmetrical. On the posterior face the zooecia are small, ogival, joined by 
their margins ; the cryptocyst is smooth and shallow ; the aperture is transverse and 
elliptical. The ovicell is endotoichal; its orifice is large and circular. On the 
anterior face the zooecia are large, hexagonal, and united among themselves; the 
cryptocyst is deep, but much smaller than the aperture which is transverse and 
elliptical. Between the zooecia there are large falciform avicularia in which the 
pivot is indicated by two large lateral teeth. 
Measurements. — Aperture of [ A«.= 0.09 mm. o .u ■ JTs=0.30mm. 
small zooecia I Zu—0.10-0.12 mm. bma zooecia 0.16 mm. 
Aperture off ha= 0.12 mm. T . \Lz=0. 35mm. 
large zooecia 0.15-0.20 mm. arge ZOOeCla l^=0.33-0.35mm. 
Affinities. — This species is as remarkable as it is problematical. We know abso- 
lutely no other bryozoan with which it can be compared. There are only two rows 
of the large zooecia, which have considerable resemblance to those of Onychocella ; 
the irregularity of the orifice is indicative of an opesium and not an aperture. 
The avicularium is analogous to that in CaTlopora tenuirostris Hincks. The small 
zooecia are arranged in six rows. Their aperture is rather small and is without 
all internal armature. Its ovicell is endotoichal. 
Cellaria hifaciata certainly belongs to a new’ genus, but unfortunately the 
rarity of specimens has not allowed us to make a detailed study. 
Occurrence. — Middle Jacksonian: Wilmington, North Carolina (rare); near 
Lenud’s Ferry, South Carolina (rare). 
Cotypes.- — Cat. No. 64012, U.S.N.M. 
Genus CIANOTREMELLA Canu, 1911. 
1911. Cianotremella Canu, Ieonographie des Bryozoaires fossiles cle l’Argentine, pt. 2, 
Annies del Museo National de Buenos Aires, vol. 21, p. 257. 
Zooecia separated laterally by a thin mural rim. The opesium is formed of a 
semicircular anter and of a convex poster. The ovicell is endotoichal and opens 
exteriorly by a salient and transverse pore. 
Genotype. — Cianotremella gigantea Canu, 1911. Rocanean of Argentina. 
