REPORT ON THE RADIOLARIA. 853 



as broad as the irregular sutural pores. Eadial spines compressed, sword-shaped, about as long as 

 the diameter of the shell. 



Dimensions. — Diameter of the outer shell 0'09, of the inner 0-04. 



Habitat. — South Atlantic, Station 332, surface. 



4. Pltractopelta tessaraspis, n. .sji. 



Outer shell composed of twenty plates, the meeting condyles of whicli are separated by permanent 

 sutures. Each plate commonly with four crossed, quadrangular, aspinal pores, the two opposite of 

 which are much larger than the two others. Sutural pores small, roundish. Radial spines com- 

 pressed, linear, about twice as long as the diameter of the shell. 



Dimensions. — Diameter of the outer shell 0-084, of the inner 0'032. 



Habitat. — North Pacific (off Japan), Station 238, surface. 



5. Phractopelta tetradopora, u. sp. 



Outer shell composed of twenty plates, the meeting condyles of which are separated by permanent 

 sutures. Each plate commonly with four crossed quadrangular (or nearly circular) aspinal pores, 

 all of nearly the same size. Sutural pores polygonal or roundish. Radial spines cylindrical, two 

 to three times as long as the diameter of the shell. 



Dimensions. — Diameter of the outer shell Oil, of the inner 0'045. 



Habitat. — North Pacific, Station 253, surface. 



G. Phractopelta hexadop>ora, n. sp. 



Outer shell composed of twenty plates, the meeting condyles of which are separated by permanent 

 sutures. Each plate commonly with six aspinal pores, the two opposite of which are ninch larger 

 than the four others. Sutural pores small, roundish. Eadial spines compressed, two-edged, larger 

 than the diameter of the shell. 



Dimensions. — Diameter of the outer shell 01, of the inner 0'04 



Habitat. — Central Pacific, Station 272, surface. 



7. Phractopelta octadopora, n. sp. 



Outer shell composed of twenty plates, the meeting condyles of which are separated by permanent 

 sutures. Each plate commonly with eight aspinal pores, the four crossed being larger than the 

 four others alternating with them. Sutural pores irregular. Eadial spines conical, shorter than 

 tlie diameter of the shell. 



Dimensions. — Diameter of the outer shell 012, of the inner 0-04. 



Habitat. — Indian Ocean (Cocos Islands, surface), Eabbe. 



