REPORT ON THE RADIOLARIA. 165 



Dimensions. Diameter of the outer shell 015, middle 013, inner 0'04; cortical pores O'OIT, 

 bars 0-003 ; length of the spines OD3. 



Habitat. Fossil in Tertiary rocks of Sicily; Grotte, Stohr. 



5. Stauracontium sparganium, n. sp. 



Cortical shell thick walled, covered with very numerous, short, conical spines, and with regular, 

 circular pores, five times as broad as the bars ; sixteen to eighteen on the quadrant. Radial pro- 

 portion of the three spheres = 2:3:9. Eadial main spines three-sided prismatic, as long as the 

 radius or longer. 



Dimensions. Diameter of the outer shell 0'275, middle 0'09, inner 0'06 ; cortical pores O'Ol, 

 liars 0-002; length of the spines 015. 



Habitat. Fossil in Barbados. 



Subgenus 3. Stauracontidium, Haeckel. 

 Definition. Pores irregular, of different size or form ; surface smooth. 



6. Stauracontium antarcticum, n. sp. 



Cortical shell thin walled, smooth. Pores irregular, roundish, two to four times as broad as the 

 bars. Eadial proportion of the three spheres =1:2:8. Eadial spines conical, as long as the radius. 



Dimensions. Diameter of the outer shell 0'2, middle 0'05, inner 0'025 ; cortical pores 0-006 to 

 0-012, bars O'OOS ; length of the spines 01. 



Habitat. Antarctic Ocean, Station 157, depth 1950 fathoms. 



Subgenus 4. Stauracontonium, Haeckel. 



Definition. Pores irregular, of different size or form ; surface covered with thorns or 

 by-spines. 



7. Stauracontium setosum, n. sp. 



Cortical shell thin walled, covered with thin bristle-shaped by-spines, half as long as the radius. 

 Pores irregular, polygonal, three to five times as broad as the bars. Proportion of the three 

 spheres = 1:2:6. Eadial main spines pyramidal, nearly as long as the shell diameter. 



Dimensions. Diameter of the outer shell 015, middle 0'05, inner 0'025 ; cortical pores O'Ol to 

 0-015, bars 0'003 ; length of the spines 012. 



Habitat. Central Pacific, Station 266, depth 2750 fathoms. 



8. Stauracontium papillosum, n. sp. 



Cortical shell thick walled, covered with short conical papillae or by-spines. Pores irregular, 

 roundish, two to four times as broad as the bars. Proportion of the three spheres =1: 3 : 12. 

 Eadial main spines conical, as long as the radius. 



