REPORT ON THE RADIOLARIA. 461 



lenticular ; the latter is eonuecteil with the lenticular })haeoid shell (or cortical shell) by 

 radial beams. 



1. Coccodiscus lamarck'ti, n. sp. (PI. 36, tig. 1). 



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

 I inies as broad as the outer and seven times as broad as the inner medullary shell, suiTounded by 

 two to three cliambered rings of equal breadth, each of which is divided by piercing radial beams into 

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

 of ef|ual size; ten on the radius of the phacoid shell, two on the breadth oi each chamber. 



Dimensions. — Diameter ol 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 darivinii, Haeckel. 



Coccodiscus danchui, Haeckel, 1862, Monogr. d. Kadiol., p. 486, Taf. xxviii. figs. 11, 12. 



Phacoid shell three times as broad as tlie 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 chaml)er. 



Dimeiisions. — Diameter of the disk (with eight rings) 0'."j2, of the phacoid shell O'll, outer 

 iiu'duUary shell 0'036, inner 0012. 



Habitat. — Mediterranean, Messina, surface. 



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



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

 niutlullary 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 sliell. a single one on the breadth of each 

 chamber. 



Dimensions. — Diameter of the disk (with seven rings) ()'25, of the pliacoid shell O'l, of the 

 medullary shell 0'04, inner 0"02. 



Habitat. — South Atlantic, Station o.'-!2, deptli 2200 fathoms. 



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



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

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



