162 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 6 



Distribution. — This is typically a Miocene form but has previously 

 been recorded as a living species off the coast of Mexico. The stations 

 record a range from Wrangell, Alaska, in 2 fms. to Port Culebra, Costa 

 Rica, in 3-10 fms. 



Nonionella miocenica Cushman, var. stella Cushman and Moyer 



Plate 18, Fig. 2 



Nonionella miocenica Cushman, var. Stella Cushman and Moyer, 

 Contr. Cushman Lab. Foram. Res., vol. 6, 1930, p. 56, pi. 7, figs. Ma-c, 

 —Cushman, U.S. Geol. Survey Prof. Paper 191, 1939, p. 34, pi. 9, 

 fig. 10. 



Variety differing from the typical form in the stellate character of the 

 lobate ventral end of the last-formed chamber which develops short 

 fingerlike processes over the previous sutures. 



Stations: A-1, A-2, A-4, C-10, 24, 39, 58, 73, 1052. 



Distribution. — The types of this variety came from off San Pedro, 

 California, at depths of 35-50 fms. These localities range from shallow 

 waters off Cordova, Alaska, in 2 fms. to the area off Guadalupe Island, 

 Mexico, in 50 fms. 



Nonionella basiloba Cushman and McCulloch, new species 

 Plate 18, Fig. 3 



Test small, dorsal side flattened, ventral side in the adult very convex, 

 periphery rounded to subacute; chambers about 10 in the adult whorl, in- 

 creasing rather rapidly in size as added, all visible on the dorsal side, on 

 the ventral side with the later chambers developing a very large basal lobe 

 which is inflated and comprises a large part of the test in ventral view, 

 extending down to the periphery and in peripheral view forming a distinct 

 portion offset from the earlier whorls; sutures distinct, not depressed, 

 somewhat curved ; wall smooth, finely perforate ; aperture at the periph- 

 ery, low, extending under the basal lobe on both sides. 



Length 0.25-0.30 mm; breadth 0.18 mm; thickness 0.15 mm. 



Holotype (AHF no. 35) from locality 136. 



This species has a great development of the later chambers on the 

 ventral side, resembling Nonionella jacksonensis Cushman, of the Eocene 

 but differs from that species in the more acute periphery, more rhomboid 

 form, and greater development of the ventral lobe. 



Stations: 136,343,516,517. 



