NO. 2 OSBURN: eastern pacific BRYOZOA CHEILOSTOMATA 371 



by the secondary peristome which forms a low, broad, smooth wall. The 

 operculum is yellowish in color, with a complete narrow bordering 

 sclerite and the muscle attachments situated well within from the border. 



Usually there are two pairs of lateral-oral avicularia; one pair very 

 small, situated about opposite the middle of the aperture, a little elevated, 

 close to the aperture and involved in the secondary peristome; a larger 

 pair situated about opposite the sinus, farther removed from the aperture 

 and embedded in the frontal wall; the mandibles of the smaller ones 

 are directed backward, those of the larger ones laterally. Occasionally 

 there are one or more additional avicularia, similar to the larger oral 

 ones, situated along the zooecial margin. 



The ovicell is very prominent, hyperstomial, not closed by the oper- 

 culum, the surface radiately grooved, and collared around the base, its 

 width about 0.30 mm. 



The species is dedicated to Dr. Rolf L. Bolin of the Hopkins Marine 

 Station, Pacific Grove, California, who has contributed much fine ma- 

 terial for the present monograph. 



Type, AHF no. 78. 



Type locality, off Point Sur, California, 36°20'45''N, 121°06'15"W, 

 at 208 fms, Bolin and Budd, collectors, several colonies. Also at Han- 

 cock Station 1387-41, east of Santa Rosa Island, southern California, 

 33°54'05''N, 119°54'10"W, at 52 fms. 



