FORAMINIPEEA OF NORTH PACIFIC OCEAN. 



53 



the length of the base. With this exception the characters seem to 

 be rather constant in the specimens examined. 



Fig. 58.— Verrucina rudis. x 10. a, side view; b, viewed from above. 



Genus CRITHIONINA Goes, 1894. 



Crithionina Goes (type, C. mantilla Goes) Kongl. Svensk. Vet. Akad. Handl., 

 vol. 25, no. 9, 1894, p. 14; Bull. Mus. Comp. Zool., vol. 29, 1896, p. 24 — 

 Rhumbler, Arch. Protistk., vol. 3, 1903, p. 229. 



Description. — Test spherical, lenticular, or variously shaped, inte- 

 rior either labyrinthic or with a single chamber, apertures small and 

 scattered or indistinct, wall thick, composed of sponge spicules or very 

 fine sand, often chalky in appearance. 



This genus which has a considerable development in the Arctic 

 and North Atlantic oceans seems to find similar conditions off the 

 western coast of North America where several species occur. They 

 seem in most cases to be specifically distinct from the Atlantic and 

 Arctic forms. Four species occur off the west coast of America. 



CRITHIONINA RUGOSA Goes. 



Crithionina rugosa Goes, Bull. Mus. Comp. Zool., vol. 29, 1896, p. 24, pi. 2, 

 figs. 3, 4.— Rhumbler, Arrh. Protistk., vol. 3, 1903, p. 232, fig. 59 (in text). 



Crithionina abyssorum (part) Ki.er, Norske Nordhavs-Exp., no. 25, 1899, p. 7, 

 pi. 1, fig. 4 (not 1-3). 



