FORAMINIFERA OF NORTH PACIFIC OCEAN. 101 



Genus EHRENBERGINA Reuss, 1850. 



Ehrenbergina Reuss (type, E. serrata Reuss), Denksehr. Akad. Wiss. Wien.vol. 1, 

 1850, p. 377.— H. B. Brady, Rep Voy Challenger, Zoology, vol. 9, 1884, 

 p. 433. 



Cassidulina (part) d'Orbigny, Foram. Amer. Merid., 1839, p. 57. 



Description. — Test free, composed of numerous chambers arranged 

 biserially about an elongate axis, evenly united on the dorsal border 

 but forming a deep groove on the ventral border, generally triangular 

 in cross section; wall calcareous; aperture elongate, nearly at right 

 angles to the edge of the chamber, smooth or ornamented with spines 

 or ridges. 



Brady, in the Challenger Report, speaks of this genus as almost 

 confined to the southern hemisphere. This has been largely due to 

 lack of material, in the Pacific at least, for in the present work it 

 has been found at a great many stations and often in very consider- 

 able numbers. 



EHRENBERGINA SERRATA Reuss. 



Ehrenbergina serrata Reuss, Denksehr. Akad. Wiss. Wien, vol. 1, 1850, p. 377, 

 pi. 48, fig. 7.— Bronn, Leth. Geog., ed. 3, vol. 3, 1853-G, p. 231, pi. 35, 

 figs. 25 a-c.— Schwager, Boll. Roy. Com. Geol. Ital., vol. 8, 1877, p. 26, 

 pi. 68.— H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 9, 1884, p. 434, 

 pi. 55, figs. 2-7. — Egger, Ahh. kon. bay. Akad. Wiss. Munchen, CI. n, vol. 

 18, 1893, pi. 7, figs. 30-32.— Goes, Kongl. Svensk. Vet. Akad. Handl., vol. 25, 

 No. 9, 1894, p. 44, pi. 8, figs. 428^30.— Chapman, Proe. Zool. Soc. London, 

 1895, p. 26.— Bagg, Proc. U. S. Nat. Mus., vol. 34, 1908, p. 140. 



Ehrenbergina serrata, var. trigona Goes, Bull. Mus Comp. Zool., vol. 29, 1896, 

 p. 49. 



Textula-ia triquetra Munster, var., Goes, Kongl. Svensk. Vet. Akad. Handl., 

 vol. 19, No. 4, 1882, p. 83, pi. 6, figs. 181, 182. 



Description. — Test longer than wide, of several chambers, arranged 

 biserially about a central axis, on the dorsal side meeting evenly to 

 form a smooth surface, on the ventral often leaving a deep groove 

 between the two adjacent series of chambers, or smooth; test trian- 

 gular, ovoid, or biconvex in transverse section; angles of the test 

 carinate, often produced into short spines; wall calcareous, finely 

 perforate; aperture an elongate, somewhat curved slit; color white. 



Length about 0.5 mm. 



Distribution. — There are a number of records published for this 

 species in the North racific. Brady, in the Challenger Report, records 

 it from but one station, in 2,340 fathoms. Goes found it in material 

 from two stations, off the west coast of America, Albatross stations 

 3375 and 3400, in 1,201 and 1,322 fathoms; Bagg records it from five 

 Albatross stations in the vicinity of the Hawaiian Islands, varying 

 in deDth from 367-1,544 fathoms. I have had material from thirty 

 or more stations in the North Pacific. It was found in material from 

 Albatross station D2S00 in 1,379 fathoms near the Galapagos Islands; 

 it occurred several times in the line of soundings from San Francisco 



