THE GENERA AND SPECIES OF ROSSE LLIDAE. 



55 



A C A N T H A S C U S, F. E. Sch. 



Hypodermal strands consist exclusively of diactins. 



42. A. cactus, F. E. Sch. 



.Schulze (Chall. Rep. Hex., p. 14s, pl. LVII 1—7). (Rev. Asc. u. Ross., p. 

 551). — Ijima (Annot. Zool. Jap., vol. 1, p. 48. 

 Loc. : Sagami Sea. 



43. A. alani, n. sp. 



An ovoid, thick-walled goblet, 1 ( J0 nun. high ; attached by a short stalk-like 

 base. Prostal needles unknown ; possibly not present. — Autodermalia exclusive- 

 ly pentactins with rather slender rays, ( J5 — 170 // long Hypodermal strands of 

 indefinite calibre. Gastralia, hexactins, not forming a continuous layer. Oxy- 

 hexasters large, witli diameter of 144 — 190 ft ; terminals more or less slender, 

 unusually 3 — 4 to each extremely short knob-like principal ; central node spheri- 

 cal. Octasters with radius of 6 H — 110 fi ; principal about as long as or longer 

 than terminals, of which 6 — 8 form an outwardly expanded tuft. Microdisco- 

 hexaster of usual shape and size present in a sparing number. 



Loc. : Sagami Sea. 



Sci. Coll., May 13th, 1898. 



rrinlal Jane 10th, 1898. 



