REPORT ON THE RADIOL ARIA. 165 



Dimensions. — Diameter of the outer shell 0'15, middle 013, inner 0-04; cortical pores 0-017, 



I O'OOS ; length of the spines 003. 



Hahitat. — 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- 

 ])ortion 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 001, 

 bars 0-002; length of the spines 015. 



Habitat. — Fossil in Barbados. 



Subgenus 3. Stauracontidtum, 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 0003 ; length of the spines 01. 



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



Subgenus 4. Stauracontonium, Haeckel. 



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

 by-spines. 



7. Stauracontium setosum, u. 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 0-01 to 

 0-015, bars 0-003 ; length of the spines 0-12. 



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



8. Stauracontium papillosum, n. sp. 



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

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

 liadial main spines conical, as long as the radius. 



