REPORT ON THE RADIOLARIA. 97 



meshes) on the thinner end of the ovate shell (corresponding to the insertion of a pear-stalk); some- 

 times two or three such large openings. 



Dimensions. Diameter of the shell 01 to 015, of the pores O'OOS to 0'016, of the bridges 0'004 

 to 0-008. 



Habitat. Tropical zone Cape Verde Islands, Ceylon; Central Pacific, Stations 266 to 272, 

 348 to 352, &c. 



7. Collosphcera polyedra, n. sp. 



Trisolenia zanguebarica,\'EhreiibeTg, 1872,'AbhandL d. k. Akad. d. Wiss. Berlin, p. 301, Taf. x. 

 fig. 11. 



Shell irregular, polyhedral, with even or somewhat vaulted sides, and obtuse ridges between 

 them. Network more or less irregular, with small rounded meshes, quite as broad or twice as 

 broad as their bars. Besides these small pores constantly some large round openings (commonly 

 three to six), situated on the corners of the polyhedral shell, four to six times as large as the pores. 

 Often an acute tooth on the edge of each large opening. Transition-form between Collosphcera 

 and Soknosphcera or Odontosphcera. 



Dimensions. Diameter of the shell 01 to 015, of the pores 0'004 to O'OOS, of their bridges 

 0'004, of the large openings 0'24 to 0'032. 



Halitat. Tropical zone of the Pacific and the Indian Ocean ; Stations 266 to 272, surface. 



8. Collosphcera tuberosa, n. sp. 



Collosphcera huxleyi, var., Haeckel, 1862, Monogr. d. Eadiol., Taf. xxxiv. figs. 3, 9. 



Shell very irregular, between subspherical and polyhedral in form, but always with irregular 

 impressions, boils or bosses, and between these different rounded prominent tubercles and ridges. 

 Network irregular, strong, with rounded, subcircular or nearly polygonal meshes. Ten to thirty pores 

 in the half meridian of the shell. Diameter of the meshes half to four times as broad as that of 

 the thick bars. 



Dimensions. Diameter of the shell very variable in the same ccenobium, 0'05 to 0'2, of the 

 pores 0-002 to O'OOS, breadth of the bridges 0'004 to 0'006. 



Habitat. Cosmopolitan, common in all warmer seas, surface. 



9. Collosphcera irregularis, n. sp. 



Collosphcera huxleyi, var., Haeckel, 1862, Monogr. d. Radiol., Taf. xxiv. fig. 8. 



Shell quite irregular, knotty or bulbous, with irregular impressions, and prominent knobs or 

 bulbs between them. Network thin, fragile, quite irregular, with polygonal meshes of most unequal 

 size and form. Five to twenty pores in the half meridian of the shell. Diameter of the meshes two 

 to ten times as broad as that of the thin bars. 



Dimensions. Diameter of the shell very variable in the same coanobium, 0'04 to 0'24, of the 

 pores 0-005 to 0'05, of the bridges 0'002 to 0'004. 



Habitat. Mediterranean, Atlantic, not common ; Stations 348, 352, &c., surface. 



(ZOOL. CHALL. EXP. PART XL. 1885.) Rt 13 



