174 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL.6 



Distribution. — Type locality, Station 548, is Cupica Bay, Colombia, 

 in 12 fms. Additional station records extend the range northward to 

 Guadalupe Island and into the Gulf of California, Mexico, with a depth 

 range of 1 1 to 32 fms. 



Elphidium stimulum Cushman and McCulloch, new species 

 Plate 20, Figs. 3, 4 



Test much compressed, rowel shaped, the periphery deeply notched on 

 account of the extensions of the chambers into pointed projections, umbili- 

 cal region slightly depressed ; chambers very distinct, increasing gradually 

 in size as added, the edge of the apertural face raised into a definite ridge, 

 the periphery extended out into pointed projections which are often ser- 

 rate; sutures obscured by the retral processes which are elongate, ex- 

 tending nearly across the chamber, thickened at the base and tapering to a 

 point, 8 to 10 in number in the adult; wall coarsely perforate, sometimes 

 papillate or slightly spinose at the outer part of the chambers; aperture 

 composed of several openings at the base of the apertural face of the 

 last-formed chamber. 



Length 0.85-1.00 mm; breadth 0.75-0.80 mm; thickness 0.20 mm. 



Holotype (AHF no. 39) from locality 409. 



This species differs from E. spinatum Cushman and Valentine in the 

 ridges of the edges of the apertural face, the very long and raised retral 

 processes, and the extensions of the chambers. 



Stations: 409, 460. 



Distribution. — Type locality. Station 409, is James Bay, James Is- 

 land, Galapagos, in 15 fms. Stations 409 and 460 are both at the same 

 locality. The Vetera III dredged in James Bay, James Island, in both 

 1933 and 1934. 



Elphidium crispum (Linne) 

 Plate 20, Fig. 5 



"Cornu Hammonis orbiculatum" Plancus (Bianchi), Conchyliologia 

 mineralogica, 1739, p. 10, pi. 1, fig. 2. 



"Nautilus minimus" Gualtieri, Index Test. Conch., 1742, pi. 19, figs. 

 A.D. 



Nautilus crispus Linne, Syst. Nat. ed. 10, 1758, p. 709; ed. 13 

 (Gmelin's) 1788, p. 3370.— Fichtel and Moll, Test. Micr., 1798, p. 40, 

 pi. 4, figs. d-f. 



