REPORT ON THE RADIOLARIA. 367 



2. Cypassis eucolpos, n. sp. 



Inner cortical shell thick walled, with regular, circular pores, twice as broad as the bars (without 

 hexagonal frames); nine to ten on the half meridian of each chamber, fifteen to seventeen on its half 

 equator. Outer cortical shell very thin, with smooth surface, and very small, irregular, roundish 

 pores, twice to three times smaller than those of the inner shell. Distance between the two cortical 

 shells about one and a half times the diameter of the inner medullary shell, which, like the outer, is 

 spherical. (The inner cortical shell resembles that of Cannartiscus amphiconiscus, PI. 39, fig. 19, 

 but without polar tubes.) 



Dimensions. Main axis of the external cortical shell 0'2, of the internal 015 ; greatest breadth 

 of the former 016, of the latter 012 ; pores of the outer 0'002, of the inner O'OOG, bars 0'003. 



Habitat.- South Atlantic, Station 319, surface. 



Subgenus 2. Didympcyrtis, Haeckel (1862). 

 Definition. Surface of the cortical shell thorny or spiny. 



3. Cypassis entomocora, Haeckel. 



Astromma entomo'-ora, Ehrenberg, 1847, Mikrogeol., Taf. xxii. fig. 32. 



Haliomma didijmum, Ehrenberg, 1844, Monatsber. d. k. preuss. Akad. d. Wiss. Berlin, p. 83. 

 IHaliomma amphisiphon, Ehrenberg, 1844, Monatsber. d. k. Akad. d. Wiss. Berlin, p. 267. 



Ommatospyris entomocora, Ehrenberg, 1875, Abhandl. d. k. Akad. d. Wiss. Berlin, pp. 66, 74. 

 ? Ommatocampe trinacria, Stohr, 1880, Palseontogr., vol. xxvi. p. 90, Taf. ii. fig. 1. 



Didymospyris entomocora, Haeckel, 1881, Prodromus. 



Didt/mocyrtis entomocora, Haeckel, 1862, Monogr. d. Radiol., p. 445. 



Inner cortical shell thick walled, with regular, circular pores, twice as broad as the bars (without 

 hexagonal frames) ; eight to nine on the half meridian of each chamber, ten to eleven on its half 

 equator. Outer cortical shell thin walled, with regular, circular pores like those of the inner. 

 Distance between the two cortical shells equals about twice the diameter of one pore (or the shor 

 axis of the lenticular double medullary shell). Surface covered with short conical spines (in ths 

 figure of Ehrenberg broken off). 



Dimensions. Main axis of the external cortical shell O2, of the internal 015 ; greatest breadt 

 of the former 013, of the latter 01 ; pores of the outer 0'005 to O'Ol, of the inner O'Ol, bars 0'004 

 length of the surface spines 0'005 to O'Ol. 



Habitat. Fossil in the Tertiary rocks of Barbados, Bermuda, and Sicily (Caltanisetta) ; als 

 living in the greatest depth of the Pacific, Stations 268, 225, depth 2900 to 4475. 



4. Cypassis puella, n. sp. (PI. 39, fig. 13). 



Didymospyris colpodes, Haeckel, 1881, Prodromus et Atlas (pi. xxxix. fig. 13). 



Internal cortical shell thin walled, with irregular, circular pores of very different size, once to 

 four times as broad as the bars ; fourteen to fifteen on the half meridian of each chamber, eighteen 



