REPORT ON THE RADIOLARIA. 143 



2. Amphispharra uranus, n. sp. 



Eadial proportion of the three spheres = 4:2:1. Cortical shell thick walled, smooth, with 

 regular, circular pores, three times as broad as the bars ; ten to twelve on the half equator. Polar 

 spines three-sided pyramidal, about as long as the diameter of the outer shell, twice as broad at the 

 base as one pore. 



Dimensions. Diameter of the outer shell 012, middle 0'06, inner 0'03 ; pores of the cortical 

 shell 0-012, bars 0'004 ; length of the polar spines 01, basal breadth 0'024. 



Habitat. Western Indian Ocean, Zanzibar, 2200 fathoms, Pullen. 



3. Amphisphcera Jupiter, n. sp. 



Eadial proportion of the three spheres = 10 : 3 : 2. Cortical shell thick walled, smooth, with 

 regular, circular pores, twice as broad as the bars ; twenty to twenty-five on the half equator. 

 Polar spines cylindro-conical, nearly as long as the axis of the outer shell, twice as broad 

 at the base as one pore. 



Dimensions. Diameter of the outer shell 0'2, middle 0'06, inner 0'04 ; pores of the cortical 

 shell O'Ol, bars O'OOS ; length of the polar spines 015 to 018, breadth 0'02. 



Habitat, South Atlantic, Station 332, depth 2200 fathoms. 



Subgenus 2. Amphisphcerella, Haeckel. 



Definition. Pores of the cortical shell regular, of nearly equal size and similar form ; 

 surface thorny or spiny. 



I 



4. Amphisphcera apollo, n. sp. 



Eadial proportion of the three spheres = 3 : 1'5 : 1. Cortical shell thick walled, spiny, with 

 regular, circular, hexagonally framed pores, of the same breadth as the bars ; twenty to twenty- 

 two on the half equator. In each hexagon-corner (between three pores) a bristle-like radial 

 spine. Polar spines cylindrical, with conical apex ; one to one and a half times as long as the 

 axis of the outer shell, as broad as three pores at the base. (Eesembles closely Xiphosphcera 

 pallas, PL 14, fig. 4, but differs in the presence of two medullary shells and the absence of the 

 fine denticulations on the hexagonal crests.) 



Dimensions. Diameter of the outer shell 012, middle 0'06, inner 0'04 ; pores and bars of the 

 cortical shell 0'006 ; length of the polar spines 015, breadth 0'02. 



Habitat. Western Tropical Pacific, Station 224, depth 1850 fathoms. 



5. Amphisplioera mercurius, n. sp. 



Eadial proportion of the three spheres = 3:2:1. Cortical shell thin walled, spiny, with regular, 

 circular pores, twice as broad as the bars ; fifteen to eighteen on the half equator ; between 



