160 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 6 



pressed in the later portion, slightly curved; wall thin, hj^aline, smooth; 

 aperture at the base of the apertural face extending over slightly onto the 

 ventral side. 



Length 0.18-0.25 mm; breadth 0.14-0.16 mm; thickness 0.12 mm. 



Stations: 4, 39, 64, 76, 105, 2056, 2067, 334, 342, 345, 502, 506, 

 509, 535, 558. 



Distribution. — ^The types of this species are from off Plymouth, Eng- 

 land. It is somewhat surprising to find this species in our material, but 

 others are knov/n to have a distribution somewhat similar in cold water. 



The smoother form figured (Fig. 7) may also be included v/ithin the 

 limits of variation of this species, at least pending the finding of additional 

 material. These localities record a range beginning with the Channel 

 Islands, off San Pedro, to Peru, with a depth variation between 4 and 45 

 fms. 



Nonionella japonica (Asano), var. mexicana Cushman and 



McCulloch, new variety 



Plate 17, Fig. 10 



Variety differing from the typical in the smaller size, rounded periph- 

 eiy, and the parallel sides of the apertural face. 



Length 0.30 mm; breadth 0.20 mm; thickness 0.05 mm. 



Holotype of variety (AHF no. 33) from locality 223. 



This is very close in most of its characters to the species described and 

 figured by Asano from the late Tertiary of Japan. 



Stations: 109, 112, 113, 222, 223, 409, 466, 468. 



Distribution. — The type locality for this new variety is Sulphur Bay, 

 Clarion Island, Mexico, in 53 fms. The other localities ranging from 

 the Channel Islands off California to the Galapagos Islands record a 

 depth range from 10 to 34 fms. 



Nonionella decora Cushman and McCulloch, new species 

 Plate 17, Figs. 11, 12 



Test asymmetrical, somewhat trochoid, spire slightly if at all raised, 

 periphery subacute; chambers numerous, 12-16 in the adult whorl, dis- 

 tinct, of rather uniform shape, increasing gradually in size as added, 

 slightly if at all inflated; sutures very distinct, raised and limbate, thick- 

 ened toward the umbilical end, curved; wall smooth except for the raised 

 sutures and the umbilical area which is slightly papillate, the papillae oc- 

 casionally extending out slightly along the sutures; aperture at the base 



