352 THE VOYAGE OF H.M.S. CHALLENGER. 



1. Si>oii(joIiva cerasinu, n. s}). 



Cortical sliell one ami a fuuitli tiinus as long as broad, with smooth surface, four times as 

 broad as the outer spherical inediillary shell. Spongy framework very compact, with very small 

 meshes, its thickness equal to the diameter of the outer medullary shell. 



Dimensions. — Length of the cortical shell 0-2, breadth 0'16; thickness of its wall O'O-i; diameter 

 of the outer medullary .shell 0'04, of the inner O'ltli. 



Ilabifaf.-^Yossil in the rocks of Barbados. 



2. Spongolica prumiNna, ii. sp. 



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

 large as the outer ellipsoidal medullary shell. Spongy framework very compact, \vith small meshes, 

 its thickness equal to the diameter of the inner medullary shell. 



Dimensions. — Length of the cortical shell 0'24, breadth 0"18 ; thickness of its wall O'Oo : size of 

 the outer medullary shell 0-08 to 0"06, of the inner 0'03. 



Habitat. — Pacific, central area, Station 2G5, depth 2900 fathoms. 



3. SpongoJira jicr.^iciua, n. sp. 



Cortical shell one and a half times as long as broad, with rough surface, five to si.x times as 

 large as the ellipsoidal outer medullar)' shell. Spongy framework loose, with large meshes, its 

 thickness about equal to the outer medullary shell. 



Dimensions. — Length of the cortical shell 0'26, breadth U'lS ; thickness of its wall 0'04 ; size 

 of the outer medullary .shell 0-045 to 0-0:35, of the inner 0-015. 



Habitat. — Equ;itorial Atlantic, Station .348, depth (2450) fathoms. 



4. Sj>ongolira nmygdalina, u. sp. 



Cortical shell twice as long as broad, with thorny surface, ten times as long as the small 

 spherical outer medullary shell. Spongy framework loose, with large meshes, its thickness one and 

 a half times as large as the outer medullary shell. 



Dimensions. — Length of the cortical shell Oo, breadth 0-16; thickness of its wall 0-045; .size 

 of the outer medullary shell 003, of the inner 0-015. 



Habitat. — Fossil in the Tertiary rocks of Sicily (Caltanisetta). 



Subgenus 2. Spongolivina, Haeckel. 

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



5. SjMngoliva opvntina, n. sp. 



Cortical shell one and a third times as long as broad, armed with numerous thin, bristle- 

 shaped, radial spines, nearly as long as the shell. Spongy framework loose, with large meshes, its 

 thickness nearly equal to the diameter of the outer spherical medullary shell. 



