698 ME. W. M. HOLMES ON RA.DIOLAEIA FROM THE [Nov. I9OO, 



Spongotbipus sp. (PI. XXXYII, fig. 11.) 



Test small, triangular, with concave sides. Spines apparently 

 short. 



Genus Tbockodiscus, Haeckel. 



The test is a simple latticed disc, with ten or more marginal or 

 radial serines. 



Tbochodiscus sp. (PI. XXXYII, fig. 12.) 



Test biconvex, with stumps of spines only remaining. Surface 

 rough; markings secondary. Diameter = *20 mm. 



Genus Uncertain. 



(PL XXXYII, fig. 14.) Test circular or slightly oval, with 

 prominent central elevation. Surface rough ; markings secondary. 

 Long diameter ='28 mm. ; short diameter = '25 mm. 



(PL XXXYII, fig. 13.) Test oval, with prominent central 

 elevation. Long diameter = "21 mm. ; transverse diameter 

 = •15 mm. 



(PL XXXYII, fig. 15.) Test lenticular. Mesh work secondary. 

 Diameter =-23 mm. 



Genus Coccodiscus, Hseckel. 



Discoidea with an extracapsular phacoid shell (or lenticular latticed 

 shell), connected by radial beams with an intracapsular, simple or 

 double, concentric medullary shell, and surrounded by one or more 

 concentric chambered equatorial girdles on the margin. 



Coccodiscus sp. (PL XXXVII, fig. 17.) 



Marginal disc of spongy meshwork. Diameter ='275 mm. 

 Diameter of central disc ='13 mm. 



Similar forms are met with in the Barbados radiolarian earths. 



Genus Tbigonoctclia, Haeckel. 



Test discoidal, with lenticular latticed cortical shell, simple 

 medullary shell, and three solid radial spines on the margin of the 

 disc. 



Tbigonoctclia sp. a. (PL XXXYII, fig. 20.) 



Test biconvex. Markings secondary. Spines imperfect. Diameter 

 =.'25 mm. Medullary shell not seen. 



Tbigonoctclia sp. /3. (PL XXXVII, fig. 24.) 



Test somewhat triangular in outline, biconvex. Surface very 



rough. Markings secondary. Greatest length = -21 mm. ; length 



of spine = -05 mm. Medullary shell not seen. 



