1896.] MICROSCOPICAL JOUKJN^AL. 163 



tion of the arms, with two rectiliuear parallel rows of 

 chambers. 



Dimensions: Diameter of pliacoid shell 0.12, of the 

 outer medullary shell 0.01; of the inner 0.015; lengtli of 

 the arms 0.165, basal breadth 0.015, distal breadth 0.09. 



Habitat. Fossil in the rocks of Barbados. 



Radiolaria; A new Genus and new Species. 



By rev. FRED'K B. CARTER, 



MONTCI.AIR, N. J. 



Dicoccura, n. gen. 



Definition: — Coccodiscida with two opposite cham- 

 bered arms on the margin of the circular disk, without 

 a connecting patagium. Medullary shell double. 



Dicoccura brevibrachia, n. sp. 



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

 and about seven times as broad as the inner medullary 

 shell, with eight pores on its radins. Arms shorter than 

 the diameter of the phacoid shell, slightly longer than 



broad at the broadest part, at the base half as broad as 

 long, at the blunt distal end rounded. Both poles of the 

 common axis of the arms bear a strong terminal spine. 



Dimensions: — Diameter of the phacoid shell 0.10, of 

 the outer medullary shell 0.04, of the inner 0.014; length 

 of the arms (without terminal spines) 0.08, basal breadth 

 0.04, distal breadth 0.066. 



Habitat: — Fossil in the rocks of Barbados. 



Note: — The basal and distal breadths are only ap- 

 proximate as the form was measured in side or three- 

 quarter view. 



