NO. 3 CUSHMAN AND MCCULLOCH : SOME NONIONIDAE 177 



entirely across the chamber, 10 to 12 in number; wall reticulate on ac- 

 count of the raised ridges and retral processes, the umbilical region often 

 with papillae and in some specimens the early portion of the whorl covered 

 with fine papillae; aperture composed of several small openings at the 

 base of the apertural face of the last-formed chamber. 



Length 0.90-1.15 mm; breadth 0.65-0.90 mm; thickness 0.30-0.50 

 mm. 



Holotype (AHF no. 41) from locality 447. 



This species differs from E. crispum (Linne) in the absence of an 

 umbonal boss, fewer chambers and very roughened surface. It is common 

 in our collections and distinctive in appearance. 



Stations: 401, 409, 423, 435, 437, 438, 441, 442, 447, 456, 458, 459, 

 460, 461, 463, 464, 465, 467, 469, 470, 471, 472, 478, 479. 



Distribution. — All of the localities listed with the exception of 423 

 are off the Galapagos Islands, with a depth range from 9 to 80 fms. 

 Stations 422, 423, and 425 (p. 23) are bottom samples from Socorro 

 Island, Mexico, m.ade by the Velero III, on the 1934 Expedition, to the 

 Galapagos. The inclusion of bottom samples from off Mexico with those 

 of Galapagos was not discovered soon enough to justify the changes neces- 

 saiy to correct the station numbers. This species is recorded at Station 423 

 in 13 fms. 



Genus ELPHIDIELLA Cushman, 1936 



Elphidiella hannai (Cushman and Grant) 

 Plate 20, Fig. 11 



Elphidium hannai Cushman and Grant, Trans. San Diego Soc. Nat. 

 Hist., vol. 5, no. 6, 1927, p. 77, pi. 8, figs. 1, 2. — Cushman, Stewart and 

 Stewart, 1. c, vol. 6, 1930, p. 62, pi. 3, figs. 16, 17. 



Elphidiella hannai Cushman, U.S. Geol. Survey Prof. Paper 191, 

 1939, p.66, pi. 19, figs. 1,2. 



Test of medium size, the diameter about twice the thickness, periphery 

 rounded but not broad, umbilical region flattened or very slightly concave, 

 rarely slightly convex; chambers distinct, 12 to 15 in the last-formed coil, 

 not inflated ; sutures very distinct, limbate, flush with the surface, with a 

 line of very fine pores, sometimes irregularly doubled, continued to the 

 center of the umbilical region, the sutures appearing as darker curved 

 lines on the lighter mass of the thick but very finely perforate wall ; aper- 

 ture consisting of a series of very fine pores along the base of the apertural 



