FOKAMINIFERA OF NORTH PACIFIC OCEAN. 21 



LAGENA COSTATA (Williamson). 

 Plate 9, fig. 6; plate 10, fig. 1; plate 12, fig. 1. 



Entosolenia costata Williamson, Rec. For. Great Britain, 1858, p. 9, pi. 1, fig. 18. 



Lagena costata Reuss, Site. Akad. Wiss. Wien, vol. 46, pt. 1, 1862 (1863), p. 329, 

 pi. 4, fig. 54. — Balkwill and Wright, Trans. Roy. Irish Acad., vol. 28 

 (Sci.), 1885, p. 338, pi. 14, figs. 10-12.— Millett, Journ. Roy. Micr. Soc, 

 1901, p. 7, pi. 1, fig. 8. — Sidebottom, Journ. Quekett Micr. Club, vol. 11, 

 1912, p. 388, pi. 15, figs. 16-20. 



Description. — Test subglobular ornamented with a few rather 

 remote ribs or costse running nearly the length of the test, frequently 

 not reaching the apex, but ending in a ring of spinose projections, 

 aperture small and rounded; costse most often rounded. 



Length 0.25 to 0.50 mm. 



Distribution. — I have had this species from Nero station 165 near 

 the Midway Islands in 2,135 fathoms, between Guam and Yokohama, 

 Nero stations 1065 in 1,321 fathoms, and 1306 in 1,208 fathoms, and 

 Albatross station D4875 in 59 fathoms off Japan. 



LAGENA COSTATA (Williamson), var. AMPHORA Reuss. 



Plate 10, figs. 2, 3; plate 12, fig. 2. 



Lagena amphora Reuss, Sitz. Akad. Wiss. Wien, vol. 46, pt. 1, 1862 (1863), 

 p. 330, pi. 4, fig. 57. 



Description. — Test elongate pyriform with a long tapering neck; 

 surface with comparatively few, prominent costae; aperture small, 

 rounded. 



Length 0.4-0.6 mm. 



Distribution. — This variety was found at the following stations: 

 Tuscarora 9, lat. 31° 51' N.; long. 119° 3' W., in 980 fathoms; Tus- 

 carora 40, lat. 33° 41' N.; long. 120° 50' W., in 1,092 fathoms; Nero 

 542 hi 1,996 fathoms between the Midway Islands and Guam; at 

 several Nero stations between Guam and Yokohama at depths rang- 

 ing from 891 to 1,632 fathoms; and two Albatross stations off Japan, 

 D4825 in 120 fathoms and D4843 in 100 fathoms. 



In this form there is much variation in the number of costse and in 

 the form as shown in the specimens here figured. 



LAGENA COSTATA (Williamson), var. POLYGONATA, new variety. 

 Plate 10, fig. 4. 



Description. — Test subglobular, apertural end somewhat reduced, 

 base truncate, polygonal in transverse section, angles reduced into 

 longitudinal costae; apical end with a polygonal depression at which 

 the costse end; aperture rounded. 



Length 0.50 to 0.85 mm. 



Distribution. — Type-specimen from Nero station 173 in 2,111 

 fathoms southeast of the Midway Islands. It also occurred at Nero 

 station 1294 in 1,417 fathoms north of Guam. 



Type.— Cut. No. 8529, U.S.N.M. 



