THE MOUNT DESEKT REGION 315 



Reuss) also records it for Canso, Nova Scotia, but I must 

 agree with Verrill in never having seen this species on the 

 American coast. 



The erect dichotomous zoarium consists of branches in 

 which the zooecia are arranged in two series, alternating and 

 facing the same direction. The membranous area on the front 

 of the zooecium is protected by a modified spine nearly as 

 large as the area. The surface of this shell or scute is figured 

 with an antler-like area. There are small frontal and larger 

 lateral avicularia. 



Tricellaria Fleming, 1828 



Tricellaeia ternata (Solander), 1786. PI. 7, fig. 3. (Os- 

 burn, 1912, p. 222 {Menipea), for references and synonymy; 

 1912 a, p. 277 (Menipea), off Cape Sable; Cornish, 1907, p. 75 

 (Menipea), Canso, Nova Scotia; Whiteaves, 1901, p. 92 

 (Menipea), for references in Canadian waters.) Taken at 

 twenty-nine stations in dredging, on hard bottoms. Not found 

 at shore stations. Chiefly represented by the variety gracilis 

 Busk. It is a very common northern species, occurring on the 

 western shores of Europe and from southern New England 

 to Greenland and other Arctic localities. 



This species shows a great variety in the number of zooecia 

 forming an internode. TJie typical three zooecia are occa- 

 sionally present, but they may range all the way to 10 or 11 

 (var. gracilis). The irregular branches spread among hy- 

 droids, Bryozoa, and the smaller algae. Two spines are 

 usually present at the outer angle and a small lateral avicu- 

 larium is usually present just back of these. A minute 

 frontal avicularium is occasionally present just proximal to 

 the aperture. 



Tricellaria peachii (Busk), 1851. PL 7, fig. 2. (Osburn, 

 1912, p. 223 (Cellularia), for synonymy and references.) Oc- 

 casional in shallower dredgings ; found at twelve stations, but 

 not taken at shore stations. A common northern species, 

 ranging from Cape Cod to Greenland and from the British 

 Islands to Spitzbergen. It has been variously placed in the 



