THE GENERA AND SPECIES OF ROS3ELLTDAE. 



53 



c'. Autodermalia with occasional pen'actins and triae- 



tins; rays faintly rough 



e". Autodermalia almost exclusively stauractins, Strong- 



•S'. heleractinus. 



a 



ly prickly 



Autodermalia, straight di actin? 



,& microchettts. 

 S. lAeorhapiädes. 



32. S. dowlingi (Lambe). 



Iìhabodocalyptus dowlingi, Lambe (Trans. Roy. Hoc. Canada, Sect. IV, 

 1893, p. 37, pl. III 2— 2h). Schulze (Rev. Asc. u. Ross., p. 554).— Slaurocahj- 

 ptus dowlingi., Ijima (Annot. Zool. Jap., vol. I, p. 53). 



Loc. : Strait of Georgia, Vancouver lai. ; Sagami Sea. 



33. S. roeperi (F. E. Sch.). 



Rhahodocalyptm roeperi, Schulze (Chall. Rep. Hex., p. 158 pl. LXV). 

 (Rev. Asc. u. Ross., p. 553). — Staurocalyptus roeperi, Ijima (Annot. Zool. Jap., 

 vol. I, p. 55). 



Loc. : S. of Puerto Bueno, Patagonia, 



34. S. g laber, Ijima. 



Ijima (Annot. Zool. Jap., vol. I, p. 57). 

 Loc. : Sagami Sea. 



35 S. microchetus, n "sp. 



A rather thin-walled compressed sack of moderately firm texture. Length 

 95 mm.; breadth 23 mm. by 37 mm.; thickness of wall at middle 3 mm. Affer- 

 ent apertures small, not over 1 mm. in diameter. — Autodermalia, stauractins 

 with attenuated, strongly prickly rays 85 [i in average length. Hypxlermfil 

 pentactins small, with paratangential rays only about 1 mm. long ; they are pro- 

 truded out of dermal layer and form a veil at about 1 mm. distance from the 

 surface. Gastralia, hexactins with rays similar to those of autodermalia. Some 

 parenchymal diactins as loii£ as 20 mm. or more. Oxyhexaster 90 — 106 /i in 

 diameter ; rays rather slender, 2 — 3 and occasionally only 1 terminal to a very 

 short principal. Octasters abundant near gastral surface, 114 — 136 ß diameter; 

 terminals weakly bent S-like, 7 — 12 forming an outwardly expanded bunch ; 

 principal thick, taking about 2 /s of the length of an entire ray. Microdis"n- 

 hexasters of usual size and shape exceedingly rare. 



Loc. : Sagami Sea. 



