162tj THE VOYAGE OF H.M.S. CHALLENGER. 



15. AulosphcBva bifiirca, n. sp. 



Kadial tubes cylindrical, straight, thorny, twice as long as the smooth, cylindrical, tangential 

 tubes, forked at the distal end, with two curved, convergent, thorny, terminal branches. (Similar 

 to Aulastrum dendroceros, PI. Ill, figs. 4«-4c, but with longer and more spinulate branches.) 



Dimensions. — Diameter of the sphere 3-2 ; tangential tubes 0-25 long, 0-01 broad. 



HaUtat. — North Pacific, Station 239, surface. 



16. AulosiohcBva trifurca, u. sp. (PL 109, fig. 9). ' 



Eadial tubes cylindrical, straight, thorny, about as long as the smooth, cylindrical, tangential 

 tubes, forked at the distal end, with three curved, convergent, terminal branches. 



Dimensions. — Diameter of the sphere 2-5 to 3-0; tangential tubes 0-2 long, O'Ol broad. 

 Habitat. — North Pacific, Station 2-iO, surface. 



17. Aulosphwra quadrifurca, n. sp. 



Eadial tubes cylindro-conical, straight, about as long as the smooth, cylindrical, tangential tubes ; 

 studded with numerous irregular lateral branches in the distal half, and armed at the distal end 

 with a cross of four divergent, forked, terminal branches. 



Dimensions. — Diameter of the sphere 4-2 ; tangential tubes 0-2 long, 0-01 broad. 



Habitat. — Indian Ocean, Madagascar (Eabbe), surface. 



18. Aulosphcera multifurca, n. sp. 



Eadial tubes cylindrical, more or less curved, three to four times as long as the smooth, often 

 curved, tangential tubes ; studded with numerous forked, irregular, lateral branches, and armed at 

 the distal end with a verticil of twelve to sixteen divergent, forked, terminal branches. 



Dimensions. — Diameter of the sphere 1-2 ; tangential tubes 0-06 long, 0-003 broad. 



Habitat. — Arctic Ocean, Greenland (Olrik), surface. 



19. Aulosphcera coronata, n. sp. 



Eadial tubes spindle-shaped, tapering from the thicker middle part towards both ends, twice as 

 long as the thorny tangential tubes, studded with numerous irregular, curved, lateral spines, and bearing 

 at the distal end a corona of twenty to twenty-five divergent, curved, terminal branches. (Similar to 

 AuloseevM flammabunda, PL 110, fig. 4.) 



Dimensions. — Diameter of the sphere 3'0 ; tangential tubes 0-2 long, 0"08 broad. 



Hahitat. — Tropical Atlantic, Station 347, surface. 



i 



