168 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 6 



Socorro Island, Mexico, in 4-10 fms., southward to Port Utria, Colom- 

 bia, in 20 fms. The records between these points show a depth range from 

 4 to 80 fms. 



Genus ASTRONONION Cushman and Edwards, 1937 



Astrononion stellatum Cushman and Edwards 

 Plate 18, Fig. 11 



Astrononion stellatum Cushman and Edwards, Contr. Cushman Lab. 

 Foram. Res., vol. 13, 1937, p. 32, pi. 3, figs. 9-11.— Cushman, U.S. Geol. 

 Survey Prof. Paper 191, 1939, p. 36, pi. 10, figs. 3-5. 



Test somewhat compressed, umbilical region slightly depressed, 

 periphery broadly rounded, lobulate; chambers 7 or 8 in the adult coil, 

 strongly inflated, of uniform shape, and increasing very gradually in size 

 as added, supplementary chambers rhomboid, the outer end in the adult 

 very tapering; sutures depressed, curved; wall smooth, distinctly but 

 finely perforate ; aperture a low, arched slit at the base of the last-formed 

 chamber, sometimes slightly subdivided, in the supplementary chambers 

 a long, low opening at the posterior peripheral margin. 



Diameter 0.40-0.60 mm; thickness 0.15-0.18 mm. 



The types of this species are from ofif Iceland, but it is well distributed 

 in the colder part of the North Atlantic. Our Pacific specimens are 

 usually smaller and slightly more compressed than the Atlantic ones but 

 otherwise seem to be identical. 



Stations: 82, 1007, 1050, 226. 



Distribution. — The records place this species near the Channel Is- 

 lands, off California, and close to Guadalupe Island, Mexico, in 34 to 

 147 fms. 



Astrononion viragoense Cushman and Edwards 

 Plate 18, Fig. 12 



Astrononion viragoense Cushman and Edwards, Contr. Cushman 

 Lab. Foram. Res., vol. 13, 1937, p. 32, pi. 3, figs. \2a, b. — Cushman, U.S. 

 Geol. Survey Prof. Paper 191, 1939, p. 36, pi. 10, fig. 6. 



Test somewhat compressed, strongly umbilicate, periphery very 

 broadly rounded, lobulate; chambers about 7 in the adult, increasing 

 rather rapidly in size as added, strongly inflated, supplementary cham- 

 bers broadly rhomboid, somewhat fused ; sutures depressed, curved, more 

 strongly so in the earlier stages; wall smooth, finely perforate; aperture 



