FOEAMINIFEEA OF NORTH PACIFIC OCEAN. 



41 



BOLIVINA KARRERIANA H. B. Brady, var. CARINATA Millett. 



Bolivinakarreriana.il. B. Brady, var. 

 1900, p. 546, pi. 1, fig. 8. 



carinata Millett, Journ. Roy. Micr. Soc, 



Description. — This variety has the test more compressed and larger 

 than in the typical form, the aperture reaching to the preceding cham- 

 ber instead of remote from it, and with the lateral borders distinctly 

 carinate; the aperture is more elongate with a long 

 tooth-like projection. 

 Length 0.75-0.80 mm. 



Distribution. — Rare in the North Pacific, occurring 

 hut once, at Nero station 1472, in 1,000 fathoms, 

 near Guam. Millett described this variety from 

 the Malay Archipelago where it occurred at several 

 stations. 



Millett remarks upon the similarity of the variety 

 to />. Jianikt niana as well as to B. karreriana, and it 

 may be that it is a distinct species. With but little 

 available material I am leaving it as Millett has 

 described it. 



BOLIVINA PUSILLA Schwager. 



Fig. «;.— Bolivina 

 karreriana, var. 



CARINATA. X 00. a, 

 FRONT VIEW; b , 



apertural view 

 (after Millett). 



Bolivina pusilla Schwager, Nocara-Ex- 

 ped., Geol. Theil, pt. 2, 1866, p. 254, 

 pi. 7, fig. 101. 



Description. — Test elongate, taper- 

 ing, composed of numerous rather 

 low broad chambers, the apical end 

 often with a very short spine, mucronate; wall orna- 

 mented with slightly raised longitudinal costse, except 

 at the apertural end where the chambers are usually 

 smooth; aperture elongate, symmetrical; color, white. 



Length about 0.40-0.60 mm. 



Distribution. — This species is well distributed in the 

 North Pacific in fairly deep water. It occurred at a 

 large number of Nero stations from the Hawaiian 

 Islands westward and along the coast of Japan. The 

 shallowest record is near Japan, at Albatross station 

 H487S, in 84 fathoms, and the deepest, Nero station 

 2049, in 2,226 fathoms, near the Hawaiian Islands, 

 number of records are from depths between 1,000 and 1,500 

 fathoms. 



These specimens seem to be identical with the species described 

 by Schwager from the fossil deposits of Kar Nicobar. The loss of 

 ornamentation in the later chambers of adult specimens is interesting. 



Fig. 67. — Bolivina 



pusilla. X 00. 



«, FRONT VIEW; 



b, apertural 



VIEW. 



The larger 



