NO. 5 CUSHMAN AND MCCULLOCH: SOME BULIMINIDAE 251 



Subfamily ReusselUnae 



Genus REUSSELLA Galloway, 1933 



Reussella pacifica Cushman and McCulloch, new species 



PlateSl, Fig. 6 



Test increasing gradually in diameter from the spinose initial end to 

 near the apertural end where in the adult it tends to narrow slightly, 

 triangular in transverse section, the sides somewhat concave, periphery 

 acute with a distinct, somewhat blunt spine at the basal angle of each 

 chamber projecting outward and somewhat backward, of clear shell 

 material and a continuation of the anterior edge of the chamber which is 

 slightly carinate ; chambers distinct, not inflated, increasing gradually and 

 rather evenly in size as added ; sutures distinct, nearly straight, slightly 

 limbate ; wall translucent, distinctly perforate ; aperture a small, rounded 

 opening at the inner margin of the last formed chamber. Maximum 

 length 0.70 mm; diameter 0.35 mm. 



Holotype (AHF no. 52) from Station 410. 



This species differs from R. aculeata Cushman in the more concave 

 sides, more elongate form, and the peripheral spines broader and less 

 acute. 



Stations: 244, 255, 311, 409, 410, 418, 421, 459, 460, 462, 468, 469, 

 471, 472, 539, 542, 600, 627, 646, 2007, 2028, 2066, 2125, 2127, 2129. 



Type locality. — Tagus Cove, Albemarle Island, Galapagos Islands, 

 in 9 fathoms. 



Distribution. — These station records place this species in the Gulf of 

 California, Mexico, off Central America, Ecuador, Galapagos Islands, 

 Alexandria, Egypt and at Kobe, Japan in shallow waters from 3 to 80 

 fathoms. 



Reussella aequa Cushman and McCulloch, new species 

 Plate31, Fig. 7 



Reussia spinulosa Cushman and Kellett (not Reuss), Proc. U. S. 

 Nat. Mus., vol. 75, art. 25, 1929, p. 9, pi. 3, fig. 10. 



Test triserial, with the early portion increasing rapidly in diameter, 

 the adult usually with the sides nearly parallel, sides flattened or very 

 slightly concave, periphery acute but not distinctly keeled, usually entire 

 but occasionally with a slight projection at the outer edge of the base of 

 the chamber but not spinose; chambers distinct, not inflated, increasing 

 very gradually in height as added in the adult portion; sutures distinct, 



