64 THE VOYAGE OF H.M.S. CHALLENGER. 



12. Cenosphcera setosa, Ehrenberg. 



Cenosphcera setosa, Ehrenberg, 1872, Abhandl. J. k. Akad. d. Wiss. Berlin, p. 287, Taf. vii fig. 1. 



Shell thin waUecI, covered with very short and numerous bristles. Pores regular, circular, five to 

 six times as broad as the bars, six to eight on the quadrant. 



Dimensions. — Diameter of the shell Ol?, pores 0'2, bars 0'03. 



Habitat. — West Tropical Pacific, 3300 fathoms ; Philippine Sea, Station 200, depth 250 fathoms. 



13. Cenosphoera plutonis, Ehrenberg. 



Cenosphcera plutonis, Ehrenberg, 1854, Mikrogeol., Taf. xsxv. B, b. iv. fig. 20. 



Shell thin walled, covered with .short conical papillre. Pores regular, circular, twice as broad as 

 the bars, eight to nine on the quadrant. 



Dimensions. — Diameter of the shell 0'09, pores 0006, bars 0'003. 

 Habitat. — North Atlantic, Station 353, depth 2965 fathoms. 



14. Cenosphcera 2:)roserpin(B, n. sp. 



Shell thin walled, smooth. Pores regular, circular, four times as broad as the bars, five to six on 

 the quadrant. 



Dimensions. — Diameter of the shell 0'08, pores O'OOS, bars 0'002. 

 Habitat. — Central Pacific, Station 265, depth 2900 fathoms. 



15. Cenosphcera eridani, u. sp. 



Shell thin walled, smooth. Pores regular, circular, three times as broad as the bars, eleven to 

 twelve on the quadrant. 



Dimensions. — Diameter of the shell 0'16, pores O'Ol, bars O'OOS. 

 Habitat, — South Pacific, Station 295, depth 1500 fathoms. 



16. Cenosphcera lethe, n. sp. 



Shell thick walled, smooth. Pores regular, circular, double-edged, five times as broad as the bars, 

 sixteen to eighteen on the quadrant. 



Dimensions. — Diameter of the shell 0"25, pores 001, bars 0'002. 

 Habitat. — North Atlantic, Station 64, depth 2700 fathoms. 



17. Cenospthcera elysia, n. sp. (PI. 12, fig. 8). 



Shell thick walled, rough. Pores regular, circular, double-edged, twice as broad as the bars, twelve 

 to fourteen on the quadrant. 



Dimensions. — Diameter of the shell 0'2, pores O'Ol, bars 0'005. 

 Hahitat.—Geuiral Pacific, Station 266, depth 2750 fathoms. 



