52 BULLETIN 161, UNITED STATES NATIONAL MUSEUM 



ELPHIDIUM SUBEVOLUTUM, new species 



Plate 12, Figures 6a, b 



Test very strongly compressed, the early coils not covered as the 

 test becomes evolute, periphery acute and distinctly keeled; cham- 

 bers numerous, strongly inflated, of nearly uniform shape, and in- 

 creasing oaly slightly in size as added, retral processes very narrow, 

 occupying but a narrow band above the sutures, which are strongly 

 depressed; wall smooth, finely perforate; aperture consisting of a 

 few pores at the base of the apertural face, indistinct. Length, 0.5 

 mm; breadth, 0.45 mm; thickness, 0.12 mm. 



Holotype. — Cushman Coll. No. 15672, from Rotonga, in 7 fathoms. 



This species is abundant at this locality but was not found else- 

 where. It is one of the few forms that is strongly evolute, and from 

 this point of view is especially interesting. 



ELPHIDIUM OCEANICUM, new species 



Plate 12, Figures 7a, h 



Polystomella sp. (?) Cushman, Carnegie Inst. Washington Publ. 342, p. 49, pi. 

 16, fig. 5, 1924. 



Test rather small, nearly circular in side view, periphery broadly 

 rounded, umbilical region depressed, and often with an irregularly 

 raised pattern; chambers distinct, very slightly inflated, of uniform 

 shape and increasing very slightly in size as added, usually 9 to 12 

 in number; sutures slightly depressed, the retral processes very dis- 

 tinct, but occupying only a narrow band above the sutures; wall 

 translucent, very finely perforate; aperture consisting of one or more 

 openings at the base of the apertural face. Diameter, 0.35-0.45 mm; 

 thickness, 0.12-0.15 mm. 



Holotype. — Cushman Coll. No. 15673, from Levuka, Fiji, in 12 

 fathoms. 



This is a small species, but hardly to be confused with any other 

 in the region. This species was figured without a name from Samoa 

 in the above reference. It is apparently a species of shoal water, 

 and besides the record from Samoa we have it in the present collec- 

 tions from 3 fathoms, Viva Anchorage, Fiji; 12 fathoms, Levuka, 

 Fiji, the type locality; 12 fathoms off Nairai, Fiji; Mokaujar Anchor- 

 age, Fiji; and Vavau Anchorage, Tonga Islands, 18 fathoms. 



ELPHIDIUM SIMPLEX, new species 



Plate 12, Figures 8, 9 



Test nearly circular in side view, periphery rounded, becoming 

 very slightly lobulated in the later portion in side view, umbilical 

 region occupied by a large flat boss; chambers 'numerous, distinct, 

 10 to 12 in the last-formed coil, of rather uniform shape, increasing 



