90 



BULLETIN 71, UNITED STATES NATIONAL MUSEUM. 



wall smooth, calcareous; aperture distinctly bulimine, loop-like, 

 rather long and narrow, extending to the umbilicus; color white. 



Diameter abouf 0.75 mm. 



Distribution. — Recorded by Brady from the Hyalonema-ground, 

 south of Japan, in 345 fathoms, and by Bagg from three Albatross 

 stations near the Hawaiian Islands, D4000, H4430, and H4555, in 

 104-1,544 fathoms. 



This is a rather anomalous species, but seems to be related to the 

 other species of the Bulimina group by its aperture, and to BulimineUa 

 by its spirally coiled form. 



Fig. 143.— Buliminella contraria. X 60. a, dorsal raw; 6, ventral view: c, peripheral 



VIEW (AFTER BRADTV 



BULIMINOIDES, new genus. 



Description. — Test triserial, spiral, elongate, subcylindrical; wall 

 calcareous, perforate; aperture nearly circular, terminal, in a depres- 

 sion of the truncated apertural end. 



This genus differs from true Bulimina in its spiral cylindrical form 

 and its central, circular, terminal aperture. It contains but one 

 speciss, B. williamsoniana (H. B. Brady). 



Type-species. — Buliminoides williamsoniana (H. B. Brady). 



BULIMINOIDES WILLIAMSONIANA (H. B. Brady). 



Bui tint nil williamsoniana H. B. Brady, Quart. Journ. Micr. Sci., vol. 21, 1881, 

 p. 56; Rep. Voy. Challenger, Zoology, vol. 9, 1884, p. 408, pi. 51, figs. 16, 17.— 

 Millett, Journ. Roy. Micr. Soc, 1900, p. 279, pi. 2, fig. 8. — Bagg, Proc. 

 U. S. Nat. Mus., vol. 34, 1908, p. 136. 



Description. — Test subcylindrical, elongate, spirally twisted, tri- 

 serial, slightly tapering, the apical end broadly rounded, the apertural 

 end obliquely truncated, depressed; chambers numerous, long and nar- 

 row, obliquely placed; sutures not clearly marked, being hidden by 

 the surface ornamentation; wall calcareous, perforate, ornamented 

 with a series of longitudinal costse, somewhat twisted, following over 

 the apertural end and continuing to the edge of the aperture, occa- 



