KEPORT ON THE RADIOLARIA. 349 



Suligenus 1. Spongodruppula, Haeckel. 

 Definition. — Surface of tlie shell smooth or rough, without radial spiues. 



1. Spongodfuppa tere})int]ia, \\. sp. 



Cortical shell one and a iliird times as long as broad, with smooth surface, three times as 

 broad as the spherical medullary shell. Spongy framework very compact, with small meshes of 

 the same breadth as the l)ars. Thickness of the spongy wall equal to the radius of the 

 medullary shell. 



Dimensions. — Length of the cortical shell (or major axis of the elli]3Soid) Old, Ijreadth (or 

 minor axis) 0-12 ; thickness of its wall 0-02 ; medullary shell 0-04. 



Hcibitat. — "Western Tropical Pacific, Station 22.5, depth 447.") faihums. 



2. Spongodrvppa pistacia, n. sp. 



Cortical shell one and a half times as long as broad, with thdrny surface, nearly five times as 

 broad as the spherical medullary shell. Spongy framework comijact, its thickness equal to the 

 diameter of the medullary shell. 



Dimensions. — Length of the cortical shell l)-2, breadth (I'U; thickness of its wall 0-03; ^ 

 medullary shell 0-0.3. 



Habitat. — Fossil in the rocks of Barliados. 



3. Spongodruppa Jenti.sca, n. sp. 



Cortical shell twice as long as broad, with rough surface, four times as large as the ellipsoidal 

 medullary shell. Spongy framework loose, with large meshes, its thickness equal to the length of 

 the medullary shell. 



Dimensions. — Length of the cortical shell 0-25, breadth Oio; ilnckness of its wall O'GG ; 

 length of the medullary shell O'OG, breadth 0-04. 



Habitat. — Pacific, central area, Station 26(>, surface. 



Subgenus 2. Spotigodnippiitm, Haeckel. 

 Definition. — Surface of the shell armed with radial spines. 



4. Spongodruppa frangida, n. sp. 



Cortical shell one and a third times as long as broad, three times as broad as the spherical 

 medullary shell. Spongy framework loose, with large meshes, its thickness half as large as the 

 diameter of the medullary shell. Surface covered with numerous (forty to fifty) thin, bristle-shaped, 

 radial spines, about as long as the cortical shell. 



