REPORT OJSr THE RADIOLARIA. 221 



Dimensions. — Diameter of the shell 012, pores 0'005 to O'Ol, bars 0-003 ; length of the main 

 spines 0'08, basal breadth O'Ol. 



Habitat. — South Atlantic, Station 325, surface. 



14. Heliosphcera Solaris, n. sp. 



Shell thick walled, with irregular, roundish pores, about the same breadth as the bars ; six to 

 eight on the radius. Fifty to eighty main spines, conical, as long as the radius ; by-spines very 

 numerous, also conical, but only as large as one pore. 



Bimcnsions. — Diameter of the shell 0'15, pores and bars 0"006 to O'OOS ; length of the main 

 spines 0-08, basal breadth 0-012. 



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



Genus 90. ConosphcBva,^ Haeckel, 1881, Prodromus, p. 451. 



Definition. — A s t r o s p h ae r i d a with one simple latticed sphere, covered with 

 radial spines having the form of hollow cones with porous walls. 



The genus Conosphcera differs from AcanthosphcBra in the peculiar formation of 

 the radial spines, which are not simple solid sticks, but hollow cones with porous walls, 

 as immediate elevations of the hollow sphere. 



1. Conosphmra platyconus, n. sp. 



Pores of the shell regular, circular, twice as broad as the bars ; ten to twelve on the radius. 

 Conical spines about sixty, regular, broader than they are high, with six to nine pores in the wall. 



Dimensions. — Diameter of the shell 0-16, pores O'OOS, bars 0'G04 ; length of the spines 0'012, 

 basal breadth 0-024. 



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



2. ConosjyhcBra orthoconus, n. sp. (PI. 12, fig. 2). 



Pores of the shell irregular, roundish, twice to three times as broad as the bars ; fourteen to six- 

 teen on the radius. Conical spines about forty, regular, higher than they are broad, as long as the 

 radius, with sixteen to twenty pores in the wall. 



Dimensions. — Diameter of the shell 0-2, pores 0-008 to 0-012, bars 0-004 ; length of the spines 

 0-05, basal breadth 0-03. 



Habitat — Central Pacific, Station 271, depth 2425 fathoms. 



1 ConospAosra = Sphere with cones ; xavos, (>■?«<{«. 



