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



Subgenus 1. Cladococcalis, Haeckel. 



Definition. Branches of the spines simple, not ramified. Pores regular, all of 

 nearly equal size and similar form. 



1. Cladococcus arborescens, J. Miiller. 



Cladococcus arborescens, J. Miiller, 1858, AbhandL d. k. Akad. d. Wiss. Berlin, p. 31, Taf. i. 

 fig. 2. 



Pores of the spherical shell regular, hexagonal, three times as broad as the bars ; three to four on 

 the radius. Ten to twenty spines, three-sided prismatic, two to three times as long as the shell 

 diameter ; towards the distal end each spine with three branches (one lateral simple straight branch 

 on each edge of the spine). 



Dimensions. Diameter of the shell 01, pores 0'012, bars 0'004 ; length of the spines 0'2 to 0'3, 

 breadth 0'02. 



Habitat. Mediterranean (Nice) ; North Atlantic, Canary Islands, surface. 



2. Cladococcus spinifer, Haeckel. 



Cladococcus spinifer, Haeckel, 1862, Monogr. d. Radiol., p. 368, Taf. xiii. fig. 9. 



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

 radius. Eadial spines, arising from all the nodal-points of the network, three-sided, longer than the 

 shell diameter, with six to twelve simple verticillate branches (two to four branches on each edge). 



Dimensions. Diameter of the shell - 08, pores O'Ol, bars 0'003 ; length of the spines 01, 

 breadth 0'03. 



Habitat. Mediterranean (Messina), surface. 



3. Cladococcus penicillus, n. sp. 



Pores subregular, hexagonal, twice as broad as the bars ; eight to ten on the radius. Sixty to 

 eighty radial spines, three-sided prismatic, pencil-shaped, longer than the shell diameter ; each at the 

 distal end with a brush or pencil composed of nine to twenty-one short, simple, curved branches 

 (three to seven on each edge). 



Dimensions. Diameter of the shell 01, pores O'OOG, bars O'OOS ; length of the spines 012 to 

 016, breadth 0'006. 



Habitat. Central Pacific, Station 271, surface. 



Sugenus 2. Cladococcinus, Haeckel. 



Definition. Branches of the spines simple, not ramified. Pores irregular, of 

 different size or form. 



