FOEAMINIFEEA OF NOETH PACIFIC OCEAN. 113 



As in the case of the preceding species this is limited to the deeper 

 and colder waters, as far as the records show. 



CYCLAMMINA ORBICULARIS H. B. Brady. 



Cyclammina orbicularis H. B. Brady, Quart. Journ. Micr. Sci., vol. 21, 1881, p. 

 53; Rep. Voy. Challenger, Zoology, vol. 9, 1884, p. 353, pi. 37, figs. 17-19. 



Description. — Test nautiloid, subglobose, hardly umbilicate, peri- 

 pheral edge rounded, composed usually of less than two complete 

 coils, the outer one completely hiding those previously developed, wall 

 finely arenaceous, somewhat labyrinthic within ; aperture a curved slit 

 at the base of the apertural face; color reddish-brown. 



Diameter 1.5-2 mm. 



Distribution. — There are four specimens in the Goes material from 

 Albatross station D3419, 772 fathoms off the west coast of Mexico, 

 that seem to belong to this species. A specimen from Nero station 

 D1204, in 846 fathoms off Japan, may be the young of this species. 



CYCLAMMINA BRADYI, new species. 



Trochammina trullissata II. B. Brady (part), Rep. Voy. Challenger, Zoology, 

 vol. 9, 1884, p. 342, pi. 40, fig. 13 (not 14, 15). 



Description. — Test free, spiral, nearly completely involute, com- 

 pressed, slightly excavated at the umbilicus, last volution with six 



to nine chambers, smooth on the 

 exterior, aperture crescentiform 

 at the base of the apertural face, 

 not included in the wall but be- 

 tween it and the preceding volu- 

 tion; apertural face occasionally 

 with perforations in adult speci- 

 mens; color yellowish or reddish 

 brown. 



Diameter 1.2-1.5 mm. 

 Fig. 174.— cyclammina bradyi. x 30 (after Distribution. — Single specimens 



BRADY), a, SIDE VIEW; b, APERTURAL VIEW. ^^J at fcwQ j^, stationS) 



1134 in volcanic mud, 2,879 fathoms, and station 1305 in globigerina 

 ooze, in 1,289 fathoms. 



The specimen figured by Brady as Trochammina trullissata, re- 

 ferred to above, seems to belong here. It is evidently a Cyclammina 

 in its characters and very different from the other specimens figured 

 as T. trullissata. This species is at once distinguished from the 

 young of Cyclammina cancellata and from C. pusilla by the smaller 

 number of chambers in each volution. 



Type-specimen.— €at. No. 8212, U.S.N.M. 



Genus LITUOTUBA Rhumbler, 189S. 

 Trochammina (part) H. B. Brady, Quart. Journ. Micr. Sci., vol. 19, 1879, p. 59; 



Rep. Voy. Challenger, Zoology, vol. 9, 1884, p. 342. 

 Lituoluba Rhumbler, Nachr. kon. Ges. Wiss. Gottingen, 1895, p. 83. Type, L. 

 lituijormis (H. B. Brady) = Trochammina lituiformis H. B. Brady. 

 16777— Bull. 71-10 8 



