1624 THE VOYAGE OF H.M.S. CHALLENGER. 



7. Aulosphcsra verticillata, n. sp. 



Radial tubes slender, cylindro- conical, straight, tapering towards the distal end, about as long as 

 the smooth, cylindrical, tangential tubes ; armed with eight to twelve verticils of three curved, 

 simple, lateral branches. (Very similar to the tubes of Aulastrum trickoceros, PL 111, fig. 5a.) 



Dimensions. Diameter of the sphere 1/6 ; tangential tubes 015 long, O'OOS broad. 



Habitat. South Pacific, Station 300, surface. 



8. Aulosphcera spathillata, n. sp. (PI. 109, figs. 7, 7). 



Eadial tubes slender, cylindro-conical, straight, tapering towards the distal end, two to three 

 times as long as the smooth, cylindrical, tangential tubes ; armed with two or three distal alternate 

 verticils, each of which forms a horizontal cross of four (sometimes three or five) equidistant 

 branches ; their distal ends are on the terminal cross simple hooks, on the proximal cross spathillre. 



Dimensions. Diameter of the sphere 3'2 ; tangential tubes 012 to 016 long, O'Ol broad. 



Habitat. South-Eastern Pacific (off Valparaiso), Station 298, depth 2225 fathoms. 



9. Aulosphcera cruciata, Haeckel (PI. 109, fig. 10). 



Aulosphcera elegantissima, E. Hertwig (non Haeckel), 1879, Organism, d. Eadiol., p. 90, Taf. ix. 



fig. 1; Taf. x. figs. 2,4, 5,8, 14, 15. 

 1 Aulosphcera pourtalesii, Duncan, 1881, Journ. Boy. Micr. Soc., p. 175, pi. iii. figs. 1-3. 



Eadial tubes slender, cylindro-conical, straight, tapering towards the distal end, twice as long as 

 the smooth, cylindrical, tangential tubes ; armed with four to eight cruciate equidistant verticils, 

 each of which forms a regular cross of four equal, horizontal, lateral branches, bearing at the end a 

 small knob or spathilla. 



Dimensions. Diameter of the sphere 1/2 to 1/8 ; tangential tubes 01 to 015 long, O'OOS broad. 



Habitat. Mediterranean (Messina), North Atlantic (Canary Islands), Caribbean Sea. 



10. Aulosphcera elegantissima, Haeckel. 



AulospJicera elegantissima, Haeckel, 1862, Monogr. d. Eadiol., p. 359, Taf. x. fig. 5; Taf. xi. 

 figs. 5, 6. 



Eadial tubes cylindrical, straight, twice as long as the smooth, cylindrical, tangential tubes ; 

 armed with four to eight equidistant verticils, each of which is composed of eight to twelve simple, 

 horizontal, lateral branches. 



Dimensions. Diameter of the sphere 1/5 to 2 ; tangential tubes 012 to 016 long, - 004 broad. 



Habitat. Mediterranean (Messina), surface. 



11. Aulosphcera bisternaria, n. sp. (PL 109, figs. 11, 12). 



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

 somewhat thorny, armed at the distal end with two alternate verticils of three branches, which bear 



