NO. 3 CUSHMAN AND MCCULLOCH : SOME NONIONIDAE 159 



about 15 in the final coil; sutures distinct, slightly depressed, strongly 

 curved; wall smooth, very finely perforate; aperture a low, curved open- 

 ing at the base of the apertural face. 



Length 0.60-0.70 mm; breadth 0.45-0.50 mm; thickness 0.30- 

 0.35 mm. 



Stations : 503, 509, 511, 516, 538, 543. 



Distribution. — Most of the previous records for this species are from 

 the Miocene of California. The living specimens seem to be identical with 

 the fossil ones. The depth range is from 18 to 55 fms. ; off Colombia, in 19 

 fms. at La Libertad, and in 50 fms. at Port Utria. 



Nonion hancockl Cushman and McCulloch, new species 

 Plate 17, Figs. 4, 5 



Test nearly circular in side view, very much compressed, umbilical 

 region slightly depressed, periphery subacute; chambers distinct, numer- 

 ous, 15 to 18 in the adult coil, very low and broad, of uniform shape, in- 

 creasing gradually in breadth as added, height changing very slightly, not 

 inflated; sutures very distinct, curved, strongly limbate; wall smooth, 

 finely perforate ; aperture a narrow, low opening at the base of the aper- 

 tural face. 



Length 0.70-0.80 mm; breadth 0.52-0.65 mm; thickness 0.20 mm. 



Holotype (AHF no. 32) from locality 561. 



This species differs from Nonion pizarrense W. Berry, in the larger 

 number and lower chambers and the very strongly limbate sutures. 



Distribution. — The type locality. Station 561, is San Juan Bay, Peru, 

 in 30-40 fms. 



Genus NONIONELLA Cushman, 1926 



Nonionella auricula Heron- Allen and Earland 



Plate 17, Figs. 6, 7 



Nonionella auricula Heron-Allen and Earland, Journ. Roy. Micr. 

 Soc, vol. 50, 1930, p. 192, pi. 5, figs. 68-70.— Cushman, U.S. Geol. Sur- 

 vey Prof. Paper 191, 1939, p. 33, pi. 9, figs. 7-9. 



Test longer than broad, strongly compressed, periphery rounded, ven- 

 trally umbilicate and involute, dorsally with the earlier coils visible; 

 chambers distinct, about 9 in the adult whorl, somewhat inflated, increas- 

 ing rapidly in size and height in the adult whorl; sutures distinct, de- 



