316 BIOLOGICAL SURVEY OF 



genera Cellularia and Scrupocellaria, and Verrill (1879, p. 53) 

 erected a new genus, Bugidopsis, for it. Harmer (1923, p. 

 355) places it in Tricellaria especially on account of its mode 

 of bifurcation. 



The spreading branches of this species are usually found 

 on other Bryozoa, hydroids, etc., reaching an inch or more 

 in height. A single stout . spine at the outer angle of the 

 aperture and occasional rounded frontal avicularia are used 

 to distinguish the species. There are no lateral avicularia. 

 The terminal zooecium of an internode bears a single median 

 stout spine. 



Caberea Laniouroux, 1816 



Caberea ellisii (Fleming), 1828. PL 4, fig. 7; pi. 8, figs. 

 1-2. (Osburn, 1912, p. 222, for references; 1912 a, p. 277, off 

 Cape Sable; Whiteaves, 1901, p. 93, for Canadian records; 

 Cornish, 1907, p. 76, Canso, Nova Scotia, 20 to 50 fathoms.) 

 Dredged at twenty-two stations; common, but not taken at 

 shore stations. Range, southern New England to Greenland, 

 western Europe to Arctic seas. 



The zoarium is erect, somewhat fan-shaped, branching. 

 Branches rather stout and slightly widened upward. The 

 zooecia are arranged in 2 to 4 rows, in alternating series, all 

 facing the same direction. The membranous aperture is large, 

 broadly elliptical, and small rounded avicularia are present 

 on the bases of the zooecia. The species is readily distin- 

 guished by the presence of a complete series of large vibracula 

 on both edges of the branch. The vibraculum is very elongate, 

 usually twice as long as the width of the branch, with sec- 

 ondary spinules, especially near the tip of the vibraculum. 

 The vibracular chambers are very large, the two series cov- 

 ering nearly the whole of the back of the zooecia on which 

 they are situated. 



