366 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 14 



color, with a narrow sinuous sclerite slightly within from the border. 

 The peristome is thin and low, raised only on the sides into low lappets. 

 There are 5 to 7 slender oral spines which are soon lost. 



The avicularia are elongate, sharp pointed and quite variable in size 

 and arrangement (length 0.13 to 0.30 mm) ; typically they are located 

 just proximal to and at one side of the aperture and are directed toward 

 the proximal end of the zooecium; sometimes they are nearly median, 

 again they may be situated at the side of the aperture and directed out- 

 ward, and rarely they are paired, one on each side of the aperture. All 

 of these variations may be found in the same colony. 



The ovicell is prominent, hemispherical or slightly elongate, 0.24 

 to 0.28 mm wide, perforated and closed by the operculum. 



The granular pleurocystal frontal, the nature of the avicularia and 

 their occasional position similar to that in the genotype, the closure of 

 the ovicell and the characters of the aperture and operculum all appear 

 to ally this species to Hippomonavella. 



Described by Hincks from Virago Sound and Cumshewa Harbor, 

 British Columbia; listed by Robertson from southern California; by 

 O'Donoghue from numerous localities in Puget Sound and British 

 Columbia, and by Canu and Bassler from the Pleistocene of Santa 

 Barbara, California. 



Hancock Stations: 18 stations about the islands off southern Cali- 

 fornia; 3 stations off Cedros Island, Lower California, and 2 stations 

 (1045-40 and 1050-40) off Tiburon Island and Angel de la Guardia 

 Island, in the upper part of the Gulf of California. The geographical 

 range appears to be from British Columbia to about 28° N Lat., and 

 the bathymetric range from shallow water to 100 fms. 



Hippomonavella parvicapitata (Canu and Bassler), 1930 



Plate 43, figs. 4-6 



Hippomenella parvicapitata Canu and Bassler, 1930:19. 



Zoaria encrusting, sometimes multilaminar. The zooecia are of 

 moderate size, 0.55 to 0.70 mm long by 0.40 to 0.50 mm wide, some- 

 what ventricose and separated by deep grooves, elliptical or long hexag- 

 onal. The frontal is a granular pleurocyst, sometimes with a low 

 umbo, surrounded by one or two rows (more rarely 3) of areolar pores. 

 The primary aperture is semielliptical, 0.14 mm wide by 0.16 mm long, 

 often narrowed slightly toward the proximal end, the proximal border 

 broadly arcuate between the small cardelles. The peristome is thin and 

 slightly elevated all around the aperture, with about six small oral 



