226 THE VOYAGE OF H.M.S. CHALLENGER. 



8. Cladococcus viminalis, Haeckel. 



Cladococms viminalis, Haeckel, 1862, Monogr. d. EadioL, p. 369, Taf. xiv. figs. 2, 3. 



Pores regular, circular, hexagonally framed, three times as broad as the bars ; five to six on the 

 radius. Eadial spines, arising from aU the nodal-points of the network, twice as long as the shell 

 diameter ; in the basal half simple, in the distal half with three to six long, thin, curved branches, 

 which are partly forked ; three edges of the spines dentated. 



Dwiensions. — Diameter of the shell 0'08, pores O'Ol, bars 0'003 ; length of the radial spines 

 0-16, basal breadth O'OOS. 



Habitat. — Mediterranean (Messina). 



9. Cladococcus hifurcus, Haeckel. 



Cladococcus hifurcus, Haeckel, 1862, Monogr. d. Eadiol., p. 368, Taf. xiii. figs. 7, 8. 



Pores regular, circular, hexagonally framed, four times as broad as the bars ; five to seven on 

 the radius. Eadial spines, arising from aU the nodal-points, three-sided prismatic, with dentated 

 edges, longer than the shell diameter. On each spine six to nine branches, which are for the 

 most part forked, the distal branches only being simple. (May be regarded as a further 

 developmental stage of Cladococcus sjnnifcr and Cladococcus viminalis.) 



Dimensions. — Diameter of the shell 0"08, pores O'Ol, bars 0'0025 ; length of the spines 01, basal 

 breadth 0-003. 



Habitat. — Mediterranean (Messina), Canary Islands, Azores, surface. 



10. Cladococcus pinetum, n. sp. (PI. 27, fig. 1). 



Pores regular, circular, polygonally framed, about the same breadth as the bars ; two to three 

 on the radius. About twenty radial spines, very large, three to four times as long as the 

 shell diameter, branched Like a pine tree, with straight, stout, three-sided prismatic stem ; three 

 prominent edges dentated. On each edge five to seven lateral branches, the distal ends of which 

 are simple, the proximal again ramified, with numerous ramules. The figured specimen is a young 

 one, with branches but little develojied. 



Dimensions. — Diameter of the shcU 0-06, pores and bars 0-008 ; length of the .spines 0-2 to 0-25 

 breadtli O'Ol. 



Habitat. — Central Pacific, Station 266 to 274, surface. 



Subgenus 4. Cladococcurus, Haeckel. 



Definition. — Branches of tke spines again ramified. Pores irregular, of diflferent size 

 and form. 



11. Cladococcus ahietinus, u. sp. (PL 27, fig- 3). 



Pores irregular, roundish, twice to four times as broad as the bars ; six to ten on the radius. 

 About twenty radial spines, two to three times as long as the shell diameter, branched hke a pine 



