REPORT ON THE RADIOLARIA. 461 



lenticular ; the latter is connected with the lenticular phacoid shell (or cortical shell) by 

 radial beams. 



1. Coccodiscus lamarckii, n. sp. (PI. 36, fig. l). 



Phacoid shell (or lenticular porous cortical shell) very thick walled (as thick as one ring), three 

 limes as broad as the outer and seven times as broad as the inner medullary shell, surrounded by 

 t wo to three chambered rings of equal breadth, each of which is divided by piercing radial beams into 

 thirty-six to forty square chambers. Margin of the disk circular, smooth. Pores regular, circular, 

 of equal size ; ten on the radius of the phacoid shell, two on the breadth of each chamber. 



Dimensions. Diameter of the disk (with two rings) 0'2, of the phacoid shell - 14, outer 

 medullary shell 0'05, inner 0'02. 



Habitat. Western Tropical Pacific, Station 220, depth 1100 fathoms. 



2. Coccodiscus darwinii, Haeckel. 



Coccodiscus darwinii, Haeckel, 1862, Monogr. d. Kadiol., p. 486, Tat', xxviii. figs. 11, 12. 



Phacoid shell three times as broad as the outer and nine times as broad as the inner medullary 

 shell, surrounded by five to eight chambered rings of equal breadth, each of which is divided by 

 forty piercing radial beams into forty square chambers of equal size. Margin of the disk smooth, 

 circular. Pores irregular, roundish, of unequal size ; eleven on the radius of the phacoid shell, one 

 to two on each chamber. 



Dimensions. Diameter of the disk (with eight rings) 0'32, of the phacoid shell Oil, outer 

 medullary shell 0'036, inner 0'012. 



ffabitat. Mediterranean, Messina, surface. 



3. Coccodiscus II. gocthei, n. sp. (PI. 36, fig. 2). 



Phacoid shell two and a half times as broad as the outer and five times as broad as the inner 

 medullary shell, surrounded by three to seven chambered rings of equal breadth, each of which is 

 divided by piercing radial beams into sixty to eighty chambers. Margin of the disk thorny. 

 Pores regular, circular ; eight on the radius of the phacoid shell, a single one on the breadth of each 

 chamber. 



Dimensions. Diameter of the disk (with seven rings) 0*25, of the phacoid shell O'l, of the 

 medullary shell 0'04, inner 0'02. 



ffabitat. South Atlantic, Station 332, depth 2200 fathoms. 



Subfamily 2. STYLOCYCLIDA, Haeckel, 1881, Prodromus, p. 458. 



Definition . Coccodiscida with solid radial spines on the margin of the 

 circular disk, situated in its equatorial plane (without chambered arms). 



