FOBAMINIFERA OF NORTH PACIFIC OCEAN. 



49 



high, the later triangular, the sutures in later growth passing 

 entirely across the test and forming an almost uniserial stage; wall 

 smooth, perforate; aperture subterminal, removed from the inner 

 edge of the chamber, elongate, with a raised border; color white. 



Length 0.75-0.S4 mm. 



Distribution. — Xot previously recorded from the North Pacific, 

 but known from off Tahiti, the north coast of New Guinea, and from 

 the Malay Archipelago. The only North Pacific station at which I 

 have found the species is Albatross station D4875, in 59 fathoms, 

 eastern channel of Korea Strait. This material is typical. 



This species is referred to Bifarina by Millett, and if that genus be 

 recognized that is its logical position. 



BOLIVINA (BIFARINA) STRIGOSA (H. B. Brady). 



Bolivina lobata, var. strigosa H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 



9, 1884, p. 425, pi. 113, fig. 7. 



Description. — Test elongate, slightly tapering, compressed; cham- 

 bers triangular, the outer posterior angle extending outward, giv- 

 ing a very lobulated margin to the test; wall 

 perfectly hyaline, except at the border, where it is 

 partially white and opaque; sutures distinct, ex- 

 tending across the test in the later chambers; 

 aperture elongate, subterminal, removed from the 

 inner border of the chamber, surrounded by a 

 raised lip; color transparent, white. 



Length 0.40 mm. 



Distribution. — Brady described this as a variety 

 of B. lobata from Torres Strait. The figured 

 specimen from Nero station 1310, in 518 fathoms, 

 between Yokohama and Guam, is in every respect 

 identical with Brady's specimen. The resem- 

 blance to B. lobata seems to be remote, and it is 

 here considered as a distinct species. 



In this same region and at corresponding depths 

 many of the other species described from Torres 

 Strait are found, and it is not surprising to 

 find this rare form here also. The arrangement 

 of the last-formed chambers strongly suggests 

 Bifarina. 



Genus PLEUROSTOMELLA Reuss, I860. 



Nodosaria (part) Reuss, Verst. Bohm. Kreid., pt. 1, 1845, p. 28. 

 Dentalina (part) Reuss, Haidinger's Nat. Abhandl., vol. 4, 1850, p. 24. 

 Pleurostomella Reuss (type, P. subnodosa Reuss.), Sit/.. Akad. Wiss. Wien, 



vol. 40, 18G0, p. 203.— H. B. Brady. Rep. Voy. Challenger, Zoology, vol.9, 



1884, p. 410. 



Description. — Test elongate, somewhat compressed, composed of 

 numerous chambers, usually biserially arranged; wall calcareous, 

 71112°— Bull. 71, pt 2—10 4 



Fig. 80.— Bolivina (Bi- 

 farina) strigosa. 

 X 120. a, aper- 

 tural view; b, 



FRONT VIEW. 



