342 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 14 



The ovicell is large, 0.40 mm wide and long, globular and prominent, 

 often radiately striated. The primary ooecium is smooth or slightly 

 granular and imperforate; the tremocyst of the succeeding zooecium 

 rises over the distal end and slightly on the sides, often giving the ovicell 

 an elongated shape. No avicularia, dietellae or spines. 



Described by Hincks from Virago Sound and Cumshewa Harbor, 

 British Columbia; listed by Robertson from Sitka, Alaska, to the Coro- 

 nados Islands, California, and by O'Donoghue from numerous localities 

 in British Columbia. It is an abundant species in shallou^ water and often 

 found in tide pools. 



Toward the southern part of its range it is much smaller and neater 

 in appearance; length 0.45 to 0.55 mm, width 0.30 to 0.35 mm; aperture 

 about 0.13 mm long by 0.14 mm wide, and the ovicell 0.25 mm in width. 

 The appearance of these and other characters is the same as in the 

 larger form, however, and there appears to be a rather regular gradation 

 of size from Alaska to southern California. South of this point only 

 the small form was found. 



Hancock Stations: Dredged at 24 stations from the coast of Oregon 

 to Cocos Island off the coast of Costa Rica, and at numerous shore 

 stations. Albatross Station 2824, in the lower part of the Gulf of 

 California. In the collection are also specimens from Nootka, Alaska, 

 and Five Fingers, British Columbia. It is most abundant in shallow 

 water but was dredged as far down as 128 fms. 



