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 fAa=0.09mm. Q ,. . (Zs=0.30mm. 



small zooecia I Zo=0.10-0.12 mm. k la lfe=0.16mm. 



Aperture of lka=0.12 mm. . (Zs=0.35 mm. 



large zooecialfe=0.15-0.20mm. La ife=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 Callopora 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 lifacinta 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). 



Co-types. Czt. No. 64012, U.S.N.M. 



Genus CIANOTREMELLA Canu, 1911. 



1911. CianotremelJa CANU. Iconographie des Bryozoaires fossiles de 1'Argentine, pt. 2. 

 Anales del Museo Naci'onal 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 gigantca Canu, 1911. Rocanean of Argentina. 



