296 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 14 



The ovicell is unusually large, very conspicuous, extending upon the 

 distal zooecium to the umbo which it sometimes involves; the surface 

 is tuberculated like the frontal and is perforated by numerous small 

 pores which are visible only on removal of the ectocyst; proximally it 

 covers the distal end of the aperture and is closed by the operculum; 

 usually a low rounded umbo on the top. It is noticeably longer than 

 broad, 0.50 to 0.60 mm long by 0,40 to 0.45 mm wide. 



Robertson described the species from "the vicinity of San Pedro," 

 southern California, under the genus Schizoporella, but the imperforate 

 frontal, the nature of the operculum, the absence of a true sinus and 

 the closure of the ovicell prevent its assignment to that genus as it is now 

 understood. 



Waters' "1 Schizoporella oligopus" from the Cape Verde Islands is 

 closely related but apparently should be renamed as the umbo is asym- 

 metrically situated in the presence of an avicularium, the aperture of 

 the ovicelled zooecia is wider and the ovicell covers much more of the 

 aperture. 



Hancock Stations: 1190-40, 1295-41 and 1662-48, Santa Cruz 

 Island, southern California; 1274-41, off Point Hueneme, southern 

 California; 1340-41 and 1896-49, Tanner Bank, near the United States 

 — Mexican boundary; 687-37, Conception Bay, Gulf of California, 

 and 450, Galapagos Islands, 0°55'00''S, 90°30'00"W. Also collected 

 by Dr. Carl L. Hubbs at Guadalupe Island, west of Lower California. 

 The known depth range is from 20 to 60 fms. 



Genus GYCLOPERIELLA Canu and Bassler, 1920 



"The ovicell is hyperstomial, globular, not embedded in the distal 

 zooecium, and entirely covers the apertura. The apertura is formed of 

 a semilunar anter and of a very concave poster. The frontal is formed 

 of a very thin olocyst supporting a tremocyst with large widened 

 pores" (Canu and Bassler 1920-431). Genotype, C. rubra Canu and 

 Bassler, 1923:137, from the Miocene and Pliocene of the southeastern 

 United States. 



It should be added that the peristome is in reality an oral shield 

 similar to that of Petralia and surrounding the true peristome which 

 may sometimes be seen within the shield. The operculum is well chiti- 

 nized with strong lateral sclerites removed from the border. Cardelles 

 small or wanting. No spines. 



