FORAMINIFERA OF NORTH PACIFIC OCEAN. 



109 



and the United States, the species has occurred in quantity at Alba- 

 tross station D3346 off Washington, 7S6 fathoms, and at station 

 D3431 in the Gulf of California, 995 fathoms. As is the case with 

 many of our west coast species of foraminifera, this species is again 

 seen in material from the coast of Japan. It occurred at Alba- 

 tross station D4975 in 712 fathoms, and D5078, in 514 fathoms. 

 Specimens, possibly the young of tin's species, were obtained at two 

 Nero stations 1184 and 12.87. in 1,542 and 1,606 fathoms. 



Fig. 167.— Cribrostomoides bradyi. x 20. a, side view; b, apertural view. 



A large series of specimens like that from Albatross station D. 3346 

 shows that this is a very different species from any of the described 

 forms to which it has usually been united. The characters in the 

 material studied are little modified by variation. 



Genus CYCLAMMINA H. B. Brady, 1876. 



Lituola W. B. Carpenter (part), The Microscope, 5th ed., 1875, p. 536. — Carter, 



Ann. Mag. Nat. Hist., ser. 4, vol. 19, 1877, p. 203. 

 Cyclammina H. B. Brady (MS.) in Norman, Proc. Roy. Soc. London, vol. 25, 



1876, p. 214; Rep. Voy. Challenger, Zoology, vol. 9, 1884, p. 350. Type, 



Cyclammina cancellata H. B. Brady. 



Description. — Test free, composed of numerous chambers in a 

 close-coiled nautiloid series, final revolution usually completely 

 embracing the preceding ones except at the umbilicus; walls thick, 

 composed of fine arenaceous material with a reddish-brown cement, 

 exterior smooth, chambers with secondary labyrinthic structures 

 interiorly, especially on the peripheral portion of each chamber, early 

 chambers often becoming completely filled by this secondary growth; 

 aperture a curved fissure at the proximal portion of the apertural 

 face, supplemented by numerous pores on the apertural wall itself. 



