130 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 14 



.. ! Gaberea ellisi (Fleming), 1828 



Plate 16, figs. 1 and 2 

 Caberea ellisi, Hincks, 1884:5. 

 Caberea ellisi, Robertson, 1905 :263. 

 Caberea ellisi, O'Donoghue, 1923 :19 ; 1925 :98 ; 1926 :41. 



The zoarium is rather coarse, the branches fan-shaped, reaching an 

 inch or more in height. The zooecia are well calcified, moderate in size 

 (about 0.50 mm long by 0.20 mm wide), the elliptical opesia occupying 

 about three-fourths of the frontal surface, and the scutum is entirely 

 wanting. Spines strong, 2 or 3 outer and 1 inner. 



Small frontal and lateral avicularia are present, the mandible rounded 

 or short-triangular. The vibracular chambers are large, covering a large 

 part of the dorsal surface, oriented diagonally and reaching nearly to 

 the midline of the branch ; the groove is long and narrow, its edges ele- 

 vated; the seta is strong and elongate, usually more than 1.00 mm, and 

 feathered toward the tip. 



The ooecia are large, 0.20 to 0.25 mm broad, smooth, somewhat 

 flattened, without pores and with an area on the frontal surface caused 

 by the failure of the ectooecium to form a complete cover. 



This species is common in the Atlantic Ocean from the British 

 Isles northward and north of Cape Cod. On the west coast it was 

 recorded by Hincks from Cumshewa and Vancouver Island, British Co- 

 lumbia ; from Juneau, Alaska, by Robertson, and O'Donoghue lists it for 

 numerous stations in British Columbia and Puget Sound. The writer has 

 collected it along the shore at several places from Santa Monica to La 

 Jolla, southern California. 



Hancock Stations: 847-38, Anacapa Island; 1007-39, 1150-40 and 

 1316-41 from Santa Catalina Island; 1336-41, Cortez Bank; 1394-41 

 and 1397-41, Santa Rosa Island, and 1418-41, Santa Cruz Island, all 

 off southern California. Station 2160, San Benito Island, Lower Cali- 

 fornia, is the most southern record. 



Genus SGRUPOCELLARIA van Beneden, 1845 

 Harmer has given such a complete diagnosis of this genus (1920: 

 364) that it is not necessaiy to mention more than a few essential points. 

 The zoarium is biserial, with corneous joints crossing the proximal ends 

 of the pair of zooecia on each side of a bifurcation, though occasionally 

 the joint may be absent. The oval or elliptical opesia occupies from one- 

 third to two-thirds of the frontal area and in most cases this is protected 

 by a forked or oval scutum, though this is wanting in a few species. 

 Distal spines are characteristic, in varying numbers and size. Both frontal 



