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



1. Spongocore velata, u. sp. 



Shell ellipsoidal, one and a half times as long as broad, without annular strictures. Spongy 

 framework loose, with rather large meshes, four to six times as broad as the bars. The whole 

 spongy shell enveloped by a delicate veil with smooth surface, connected with it by numerous thin 

 radial beams. Breadth of the spongy ellipsoid (or minor axis) six times as large as its distance 

 from the veil. 



Dimensions. — Length of the whole shell (with veil) 0'3, breadth 0-2 ; distance of the veil from 

 the spongy ellipsoid 0'0.35. 



Habitat. — South Atlantic, Station 325, surface. 



2. Spongocore diplocylindrica, n. sp. 



Shell cylindrical, three times as long as broad, without annular strictures. Spongy framework 

 compact, with small meshes, twice to three times as broad as the bars. The whole surface of the 

 spongy cylinder, with exception of both rounded polar faces, enveloped by a delicate cylindrical 

 veil with smooth surface, connected with it by numerous radial beams. Diameter of the spongy 

 cylinder twice as large as its distance from the veil. 



Dimensions. — Length of the shell 0-3, breadth (with veil) 01 ; distance of the veil 0-025. 



Hahitat. — South Pacific, Station 302, surface. 



Subgenus 2. Spongocorisca , Haeckel. 



Definition. — Shell distinctly three-jointed, ^\•ith two transverse annular 

 strictures. 



3. Spongocore chrysalis, n. sp. 



Spongy shell cylindrical, without the veil six times as long as broad, three-jointed, with two 

 annular strictures ; all three joints of the same length. The whole spongy shell enveloped by a 

 thin veil with thorny surface, connected with it by numerous radial beams. Breadth of the spongy 

 cylinder three times as large as its distance from the veil. 



Dimensions. — Length of the shell (with veil) 0-4, breadth Ol ; distance of the veil from the 

 spongy shell 0'02. 



Habitat. — South Atlantic (off Patagonia), Station 318, surface. 



4. Spongocore cincta, n. sp. 



Spongy shell cylindrical, without the veil four times as long as broad, three-jointed, with two 

 annular strictures ; all three joints of the same length. Only the middle joint enveloped by a 

 thin veil with smooth surface, connected with it by radial beams. Both terminal joints with long, 



