REPORT ON THE RADIOLARIA. 67 



outer half, sieve-shaped. Pores one to three times as broad as the bars, of very different size, four 

 to six on the quadrant. 



Dimensions. Diameter of the shell 015, pores O'Ol to 0'02, bars O005 to O'Ol. 



Habitat. Tropical Atlantic, Station 347, depth 2250 fathoms. 



29. Cenosphcera coronata, n. sp. (PI. 26, fig. 11). 



Shell thick walled, rough. Pores irregular, roundish, surrounded by high polygonal frames 

 bearing on their sharp crest a series of small papillae, so that each pore is surrounded by a 

 coronal of such spinules. Pores four to eight times as broad as the bars, four to five on the 

 quadrant. 



Dimensions. Diameter of the shell 015, pores O'Ol to 0'03, bars 0'002 to O'OOS. 



Habitat. Central Pacific, Station 272, depth 2600 fathoms. 



Subgenus 4. Porosphcera, Haeckel. 



Definition. Pores of the spherical shell irregular, roundish, without polygonal 

 frames, of unequal size or form. 



30. Cenosphcera antiqua, Haeckel. 



Cenosphcera plutonis, var., Dunikowski, 1882, Denkschr. d. k. Akad. d. "Wiss. Wien, Bd. xlv. 



p. 25, Taf. iv. figs. 47, 48, 

 Cenosphcera plutonis, var., Stbhr, 1880, Palaeontogr. xxvi. p. 85, Taf. i. fig. 1. 



Shell thin walled, smooth. Pores irregular, roundish, two to eight times as broad as the bars, 

 ten to fifteen on the quadrant. 



Dimensions. Diameter of the shell 015 to 0'2, pores 0'007 to 0'015, bars 0'002 to O'OOS. 



Habitat. Fossil in the Jurassic, Cretaceous, and Tertiary formations ; living in the depths of 

 the Atlantic and Pacific ; Station 332, depth 2200 fathoms ; Station 225, depth 4475 fathoms, &c. 



31. Cenosphcera gigantea, n. sp. 



Shell thick walled, smooth. Pores irregular, roundish, two to five times as broad as the bars, 

 thirty to forty on the quadrant. 



Dimensions. Diameter of the shell 0'4 to 0'5, pores 0'004 to O'Ol, bars 0'002. 

 Habitat. Central Pacific, Station 268, depth 2900 fathoms ; also fossil in Barbados. 



32. Cenosphcera marginata, n. sp. 



Shell very thick walled, smooth. Pores irregular, roundish, double-edged, three to eight times 

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



