REPORT ON THE RADIOLARIA. 143 



2. AmphisphcBra uranus, n. sp. 



Eadial propoitiou of tlio three s^jheres = 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 l^readtli 0-024. 



Hahitaf. — Western Indian Ocean, Zanzibar, 2200 fathoms, I'ullen. 



3. AmpkisplicBra Jupiter, n. sp. 



Eadial proportion of the three spheres = 10 :.?>: 2. Cortical shell tliick walled, smooth, with 

 regular, circidar 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 tlie outer shell 0-2, middle 0-06, inner 0-04 ; pores of the cortical 

 shell 0-01, bars 0-005 ; length of the polar spines 0-1.5 to 0-18, breadth 0-02. 



Hahitat. — South Atlantic, Station 332, depth 2200 fathoms. 



Subgeuiis 2. AmpMsphcBrella, Haeckel. 



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

 surface thorny or spiny. 



4. AmphispjhcEra apoUo, 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 j)ores) 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 jjores at the base. (Eesembles closely Xipliosi^hwra 

 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 0-12, middle 0-06, inner 004 ; pores and liars of the 

 cortical .shell 0-006 ; length of the polar spines 0-15, breadth 0-02. 



Hahitat. — Western Tropical Pacific, Station 224, depth 1850 fathoms. 



5. AmphisphcEra 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 



