FORAMINIFERA OF NORTH PACIFIC OCEAN. 



Ill 



Fig. 171.— Cyclammina cancel- 

 lata. x s. from photo- 

 graph, the microsphere 

 form of the species with a 

 larger number of cham- 

 bers in the adult whorls 

 and attaining a larger size 

 than the megalospheric 



FORM. 



records it from Albatross station D2860 in 876 fathoms off the 



coast of British Columbia. I have found the species in material from 



Albatross station D3346 in 7SG fathoms off 



Oregon, Hi 135 in 2, 848 fathoms just south of 



Unalaska, Aleutian Islands, and twice in the 



vicinity of Japan, D4900 and D4975, in 139 



and 712 fathoms. 



As a rule, this species seems to be found in 

 cold and rather deep water, following rather 

 well the faunal lines already spoken of in the 

 introduction. 



The microspheric form of the species grows 

 to a large size with more complicated laby- 

 rinthic structures and apertures. The megalo- 

 spheric form is smaller and less complicated 

 in its structure. The two forms are shown 

 in Flint's plates, plate 27, fig. 3, showing the 

 microspheric form, plate 28, fig. 1, the megalo- 

 spheric. The megalospheric proloculum is considerably larger than 

 that of the microspheric form. 



CYCLAMMINA PUSILLA H. B. Brady. 



Cyclammina pusilla H. B. Brady, Quart. Journ. Micr. Sci., vol. 21, 1881, p. 53. — 

 Goes, Kongl. Svensk. Vet. Akad. Handl., vol. 25, no. 0, 1894, p. 32, pi. 6, 

 figs. 242-244.— Chapman, Proc. Zool. Soc. London, 1895, p. 18.— Goes, Bull. 

 Mus. Comp. Zool., vol. 29, 1896, p. 32.— Flint, Rep. U. S. Nat. Mus., 1897 

 (1899), p. 282, pi. 28, fig. 2. 



Description. — Test nautiloid, small, compressed, umbilicate, periph- 

 eral edge rather thin, almost keeled in some specimens, often lobu- 

 lated by successive chambers, composed of three coils, the last-formed 

 one enveloping the others except at the umbilicus; wall finely arena- 

 ceous, inclined to be porous, especially within, but not building defi- 

 nite labyrinthic structures ; aperture a curved slit at 

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

 Diameter 0.5-1.5 mm. 



Distribution. — There are two Challenger records 

 for this species, stations 237 and 246, at 1,875 and 

 2,050 fathoms, one east of Japan, the other in the 

 middle of the North Pacific. • Goes found the spe- 

 cies at two Albatross stations in the eastern tropical 

 North Pacific in 772-1,201 fathoms. Flint records 

 this species from Albatross station D3080, off the 

 coast of Oregon, in 93 fathoms. I have found specimens at one station 

 near the Hawaiian Islands, Nero station 2032 in 1,014 fathoms; also 

 at three Nero stations 1134, 1305, 1308, near the Bonin Islands in the 

 northwestern Pacific, 2,879, 1,289, and 1,040 fathoms; and at two 

 Albatross stations of the 1902 cruise, D4957 D4958, at 405 and 

 437 fathoms, off the south coast of Japan. 



Fig. 172. — Cyclammina 

 pusilla. x 25. from 

 photograph. 



