NO. 1 OSBURN : EASTERN PACIFIC BRYOZOA — CHEILOSTOMATA 135 



to be common along the coast from southern California southward to 

 Costa Rica and Cocos Island. 



Type, AHF no. 32. 



Type locality, Newport Harbor, California. 



Hancock Stations: 253-34, 254-34, 255-34, 799-38, off Costa Rica; 

 870-38, Isabel Island, Mexico; 540-36, 1045-40, 1053-40, Gulf of Cali- 

 fornia; 287-34, Cedros Island, off Lower California, and various sta- 

 tions around Santa Catalina Island, California. 



Scrupocellaria calif ornica Trask, 1857 

 Plates 16, figs. 6 and 7, and 20, fig. 5 



Scrupocellaria calif ornica Trask, 1857 :1 14. 

 Scrupocellaria brevisetis Hincks, 1882 : 462. 

 Scrupocellaria calif ornica, Robertson, 1905:259. 

 Scrupocellaria calif ornica, O'Donoghue, 1923:18; 1926:40. 



Zoarium erect, tufted, with numerous branches; internodes with 

 usually 3 or 4 zooecia in a series ; joint immediately proximal to the outer 

 opesia, sometimes involving its lower border slightly. 



Zooecia averaging 0.40 mm long by 0.20 mm wide, narrowed to 0.13 

 at the proximal end, the outer border nearly straight. Opesia elliptical, 

 occupying half or more of the frontal length ; cryptocyst moderately de- 

 veloped, finely granulated. Scutum small and narrow, sometimes a mere 

 curved spine, at other times it is broadened distally (paddle-shaped), the 

 proximal lobe only being developed ; at its fullest development it covers 

 only a small part of the opesia. Two strong outer spines, with occasionally 

 a third smaller one, and one or two small inner spines. 



The frontal avicularia are all small, located on nearly all of the zo- 

 oecia. The lateral avicularia also are rather small, but these are fre- 

 quently replaced, especially toward the ends of the branches, but giant 

 avicularia of about the same form. In these giant avicularia the base may 

 be more than half as long as a zooecium, the mandible is triangular and 

 the rostrum is very strongly hooked. 



The vibracular chamber is small, often wanting, its groove trans- 

 verse; the seta short and weak, usually much less than the length of a 

 zooecium. The radicle chamber is at the outer side of the proximal end 

 of the vibracular chamber and about equal to it in size. 



The ooecia are rounded, about 0.20 mm in width, without pores and 

 smooth except for a trace of fine lines. 



It is quite probable that the S. brevisetis of Hincks from Houston 

 Stewart Channel, British Columbia, is identical with calif ornica, but 



