NO. 5 CUSHMAN AND MCCULLOCH : SOME BULIMINIDAE 259 



becoming obsolete and spinous on the last-formed chamber; aperture 

 large, at the end of a short, broad neck, surrounded by a narrow, flaring 

 lip. 



Length 0.85-1.25 mm; diameter 0,35-0.50 mm. 



Holotype (AHF no. 56) from Station 55, where it occurs very- 

 abundantly. 



The unnamed species referred to in the reference above is from the 

 Pliocene of Timms Point, California, and appears to be the same as this. 



This species differs from U. peregrina Cushman, var. curticosta 

 (Cushman) and var. dirupta, n. var. in its lower, more regular, and 

 much more numerous costae, and its more elongate shape. 



A very few specimens show a marked rugosity in addition to the 

 costae, and may represent a varietal form, but they are not separated here. 



A single specimen from Station 1106, questionably referred here, 

 is interesting as it possesses two complete apertures from the last- 

 formed chamber. Such a freak development in this group of the for- 

 aminifera has been noted previously. (See Uvigerina canariensis d'Or- 

 bigny, var. distoma de Amicis [Atti Soc. Toscana Sci. Nat., vol. 14, 1894, 

 p. 14, pi. 2, fig. 5] from the Pliocene of Sicily and Uvigerina angulosa 

 Williamson of Heron-Allen and Earland, \Discovery Reports, vol. 4, 

 1932, p. 397, pi. 12, fig, 38] from Recent material from off the Falkland 

 Islands.) In these cases the apertures were from two different chambers 

 while in this case they are from the single, last-formed chamber. 



It is also found at the following stations: 56, 57, 58, 60, 64, 67, 230, 

 251, 299, 552, 1069, 1077, 1080, 1083, 1103, 1117, 1173, 1194, 1198, 

 2000, 2014, 2070, 2100, 2101, 2144, 2151, 2162. 



Distribution. — The type locality, Station 55, is Los Islets, North Isla 

 Partida, Mexico, bearing west, in 183 fms. An analysis of the other sta- 

 tion records shows a range off the Channel Islands, in the Gulf of Cali- 

 fornia southward to Callao, Peru, in 210 fms. 



Uvigerina hoots i Rankin 

 Plate 33, Fig. 3 

 Uvigerina hootsi Rankin, in Cushman and Kleinpell, Contr. Cush- 

 man Lab. Foram. Res., vol. 10, 1934, p. 22, pi. 3, figs. 8, 9, — Woodring, 

 Bramlette, and Kleinpell, Bull, Amer. Assoc. Petr. Geol., vol. 20, 1936, 

 pp. 141, 144, 147 (lists).— Kleinpell, Miocene Stratig. Calif., 1938, 

 p. 295, pi. 22, fig. 6. — Cushman and Todd, Contr. Cushman Lab. 

 Foram. Res., vol. 17, 1941, p. 46, pi. 13, figs. 16, 17. 



