REPORT ON THE RADIOLARIA. 



341 



I. Subfamily 



Spongellipsida. 



(Ellipsoidal shell composed only 

 of a spongy framework, 

 without a latticed medullary 

 shell in the centre.)] 



IL Subfamily 



Spongodruppida. 



(Ellipsoidal shell composed of 

 an outer spongy cortical 

 shell and an inner latticed 

 medullary shell. ) 



Synopsis of the Genera of Spongurida 



Spongy shell with in- ) 

 ternal cavity. j 



Spongy shell solid, with- 

 out internal cavity. 



Medullary shell simple. 



Medullary shell double 



Without lattice mantle. 

 No polar spines, 



With lattice mantle No 

 polar spines, . 



Without lattice mantle. 

 Two opposite spines on 

 the poles of the axis, 



No polar spines, 



Two opposite spines on the 

 poles of the axis, 



No polar spines, 



Two opposite spines on the 

 poles of the axis, . 



144. Spongellipsis. 



145. Spongurus. 



146. Spongocore. 



147. Spongoprunum. 



148. Spongodruppa, 



149 Spongatractus. 



150. Spongoliva, 



151. SpongoxipJius. 



Subfamily 1. SPONGELLIPSIDA, Haeckel 



Definition. S pongurida with a spongy ellipsoidal or cylindrical shell, without 

 an internal latticed medullary shell. 



Genus 144. Spongellipsis, 1 n. gen. 



Definition. S pongurida with an ellipsoidal or cylindrical spongy shell, contain- 

 ing an internal cavity, without a latticed medullary shell. Polar spines absent. 



The genus Spongellipsis embraces those very simple Spongurida in which the 

 ellipsoidal central capsule is enclosed in a spongy cortical shell of the same form. It 

 corresponds, therefore, to Plegmosphcera among the Sphaeroidea, to Plegmodiscus 

 among the Discoidea, and to Spongolarcus among the Larcoidea. In some 

 species the ellipsoidal form is prolonged and passes into a cylindrical one. 



Subgenus 1. Spongellipsarium, Haeckel. 

 Definition. Surface of the shell smooth or rough, without radial spines. 



1 Spongellipsis = Spongy ellipsoid ; 



