REPORT ON THE RADIOLARIA. 227 



tree, with straight, stout, three-sided pyramidal stem. From tlie dentated edges arise numerous 

 verticillate branches, the proximal ends of which are thickly ramified. (Differs from the preceding 

 and similar species mainly in the large size and irregular lattice-work of the shell.) 



Dimensions. — Diameter of the shell 0-12 to O'U, pores 0-006 to 0-012, bars 0-003 ; length of the 

 spines 0-25 to 0-4, breadth 0-012. 



Habitat. — North Pacific, Station 256, surface. 



12. Cladococcus tricladus, n. sp. 



Pores irregular, polygonal, twice to eight times as broad as the bars ; eight to ten on the radius. 

 About twenty radial spines, three-sided prismatic, twice as long as the shell diameter ; in the 

 proximal half simple, with smooth edges ; in the distal half with three diverging curved branches, 

 which bifurcate two to three times or ramify irregularly. (Closely related to the simpler 

 Cladococctcs quadricuspis.) 



Dimensions. — Diameter of the shell 0-16, pores 0-04 to 0-016, bars 0-002 ; length of the spines 0-3, 

 breadth 0-012. 



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



13. Cladococcus stalactites, u. sp. (PI. 27, fig. 4). 



Pores irregular, roundish, once to five times as broad as the bars ; eight to ten on the radius. 

 About twenty radial spines, very stout, longer than the shell diameter, with three wing-like, 

 prominent smooth edges. At the middle, or in the distal half, each spine bears a verticil of three 

 strong, irregularly formed ramified branches. 



Dimensions. — Diameter of the shell 0-14, pores O'OOS to 0-015, bars 0-003 ; length of the spines 

 0-16 to 0-2, breadth 0-02. 



Habitat. — West Tropical Pacific, Station 220, depth 1100 fathoms. 



14. Cladococcus dendrites, n. sp. (PI. 27, fig. 5). 



Pores irregidai', rouncUsh, with denticulate margin, twice to four times as broad as the bars ; eight 

 to twelve on the radius. Fifty to eighty radial spines, three-sided prismatic, with elegantly 

 denticulated edges ; in the proximal two-thirds simple, in the distal thii-d with a bunch of ten to 

 twenty short simple spines (three to seven on each edge). 



Dimensions. — Diameter of the shell 0-16 to 0-2, pores 0-006 to 0-012, bars 0-003 ; length of the 

 spines 0-2 to 0-3, breadth 0-01. 



Habitat. — Antarctic Ocean, Station 157, dejAh 1950 fathoms. 



Genus 93. Elaphococcus,^ Haeckel, 1881, Prodromus, p. 450. 



Defiyiition. — As t r o sph ser id a -with one simple lattice-sphere, covered -nuth 

 forked or dichotomously branched radial spines (the stem of the spine always forked). 



' £topAococcus = Shell with harts' horn-shaped spines ; ihet(fos, xoV.xof. 



