NO. 3 CUSHMAN AND MCCULLOCH : SOME NONIONIDAE 169 



at the base of the apertural face, subdivided into numerous small open- 

 ings, those of the supplementary chambers low, at the posterior peripheral 

 side. 



Diameter 0.35-0.60 mm ; thickness 0.20-0.30 mm. 



The types of this species are from Virago Sound, British Columbia. 

 Our material extends the known range considerably southward. 



Stations: 1005, 1007,2070,412. 



Distribution. — The range has been extended now from the type lo- 

 cality to the regions of the Channel Islands off California, in 49-54 fms. ; 

 Guadalupe Island, Mexico, in 250 fms. ; and to the north side of Duncan 

 Island, Galapagos, in 111 fms. 



Genus ELPHIDIUM Montfort, 1808 



Elphidium simplex Cushman 

 Plate 19, Fig. 1 



Elphidium simplex Cushman, Bull. 161, U.S. Nat. Mus., pt. 2, 1933, 

 p. 52, pi. 12, figs. 8, 9; U.S. Geol. Sui-vey Prof. Paper 191, 1939, p. 62, 

 pi. 17, fig. 10. 



Test nearly circular in side view, periphery rounded, becoming very 

 slightly lobulate in the later portion, umbilical region with a large flat 

 boss; chambers numerous, distinct, 8 to 12 in the last- formed coil, of 

 rather uniform shape, increasing gradually in size as added, later ones 

 slightly inflated ; sutures distinct, depressed, rather strongly curved, par- 

 ticularly in the earlier stages, retral processes often indistinct but usually 

 visible, especially in the later chambers ; aperture consisting of one or more 

 openings at the base of the apertural face. 



Length 0.30-0.55 mm; breadth 0.28-0.45 mm; thickness 0.12-0.15 

 mm. 



This is a characteristic Indo-Pacific species. 



Stations: C-11, C-12, 4, 14, 111, 133, 144, 1018, 1062, 263, 322, 436, 

 469, 472. 



Distribution. — This Indo-Pacific species is now recorded off Califor- 

 nia, at Gaviota Pier, in 8 fms. ; Morro Bay, in 2 fms. ; off the Channel 

 Islands, in 2 to 45 fms. ; in the Gulf of California, in 8 fms. ; off Central 

 America and Galapagos, in 2 to 15 fms. 



