FOKAMINIFERA OF NORTH PACIFIC OCEAN. 



63 



HYPERAMMINA MAXIMA, new species. 



Description. — Test elongate, straight or slightly curved, large, 

 composed of a swollen proloculum and an elongate tubular chamber; 

 wall thick, composed of sand grains and sponge spicules, rather 

 loosely cemented, aperture rounded, formed by the open end of the 

 tube; color gray or light brownish-gray. 



Length up to 40 mm., diameter 2 mm. 



Type-specimen.— Oat. No. 8211, U.S.N.M., from Albatross station 

 D4337, off California. 



This species is much larger than any of the others of the genus. 

 Its walls have a large proportion of sponge spicules. At the type 

 station this species occurred in great quantities 

 with other arenaceous species. 



HYPERAMMINA SUBNODOSA H. B. Brady. 



Rhabtlo pleura, species, G. M. Dawson, Ann. Mag. Nat. 



Hist., ser. 4, vol. 7, 1871, p. 86, fig. 7. 

 Hy pent m m in a subnodosa, H. B. Brady, Rep. Voy. 



Challenger, Zoology, vol. 9, 1884, p. 259, pi. 23, figs. 



11-14. — Egger, Abh. kon. bay. Akad. \Yiss. Miin- 



chen, vol. IS, 1893, p. 255, pi. 4, fig. 32.— Goes, 



Kongl. Svensk. Vet. Akad. Hand] , vol. 25, No. 



9, 1S94, p. 16, pi. 3, figs. 42-53 (not 54).— Schlum- 



berger, Mem. Soc. Zool. France, vol. 7, 1894, 



p. 254.— Rhumbler, Arch. Protistk, vol. 3, 1903, 



p. 259, fig. 100 a, b (in text). 



Description. — Test elongate, subcylindrical, 

 comparativel}^ large, proximal end enlarged into 

 a thick-walled proloculum, tube constricted at 

 intervals and with much thicker walls, coarsely arenaceous, aperture 

 at the distal end of the tube, circular; color grayish. 



Length up to 18 mm. 



Distribution. — This species seems to be rare in the North Pacific. 

 There are five records of its occurrence: Challenger stations 237, 241 

 east of Japan, in 1,875 and 2,300 fathoms; one station in the Okhotsk 

 Sea, recorded by Schlumberger, in 280 meters ; one Albatross station 

 D5026, also in the Okhotsk Sea but a short distance from the preceding, 

 119 fathoms; and Nero station 1161, near the Bonin Islands, in 2,384 

 fathoms. 



Figs. 77-79.— Hyperammina 

 maxima. x 2. from pho- 

 TOGRAPH. 



