EEPORT ON THE RADIOLARIA, 65 



18. Cenosphcera nirwana, n. sp. 



Shell thick walled, smooth. Pores regular, circular, twice as broad as the bars, twenty-four to 

 twenty-five on the quadrant. 



Dimcnsions.^Diametev of the shell 0'25, pores 0'004, bars 0'002. 

 Habitat. — Indian Ocean, Belligemma, Ceylon, surface ; Haeckel. 



19. Cenosphcera maxima, n. sp. 



Shell thick walled, smooth. Pores regular, circular, twice as broad as the bars, thirty to thirty- 

 three on the quadrant. 



Dimensions. — Diameter of the shell 0'3 to 04, pores 0'012, bars O'OOG. 



Habitat. — West Tropical Pacific, Station 225, depth 4475 ; also fossil in Barbados. 



20. Cenosphcera compacta, n. sp. (PL 12, fig. 7). 



Shell very thick walled, rough (its wall one-fourth to one-third as thick as the radius). Pores 

 subregular, circular, of the same breadth as the bars, seven to eight on the quadrant. 

 Dimensions. — Diameter of the shell 0"15, pores and bars 0'012. 

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



21. Cenosphcera crassa, n. sp. 



Shell very thick waUed, rough (its wall nearly half as thick as the radius). Pores tubidar, 

 double-edged, regular, cii-cular, ten times as broad as the thin united bars, twelve to fourteen on the 

 quadrant. 



Dimensions. — Diameter of the shell 0'14, pores 0"01, bars O'OOl. 



Habitat. — Central Pacific, Station 268, depth 2900 fathoms. 



22. Cenosphcera solida, n. sp. 



Shell very thick walled, covered with innumerable short bristles (its wall one-third as thick as 

 the radius). Pores regular, circular, four times as broad as the bars, tubular, eight to ten on the 

 quadrant. 



Dimensions. — Diameter of the shell 0-2, pores 0-02, bars 0-005. 



Hdbitat. — Antarctic Ocean, Station 157, depth 1950 fathoms. 



Subgenus 3. Cyrtidosphcera, Haeckel, 1862, Monogr. d. Radiol., p. 348. 



Definition. — Pores of the spherical shell ii'regularly polygonal, of unequal size or 

 form, sometimes roundish with polygonal frames. 



(ZOOL. CHALL. EXP. — PART XL. — 1885.) Rr 9 



