4/8 



H. MATSUMOTO : 



spines to each tentacle pore, and the latter to have the disk plates and 

 radial shields of very regular size and arrangement and three to seven 

 arm spines to each tentacle pore. The disk coverings of the present 

 species are not so irregular as in the former, and not so regular as in 

 the latter. In the number of the arm spines, the present species is 

 nearer to the former than to the latter. Moreover, I have some doubts 

 as to the generic distinction of Astrothorax from Astrothrombus. So 

 that, I am inclined to refer the present species to Astrothrombus at 

 least for the present. 



3. Ophiopholis mirabilis (Duncan). 

 Clark, loc. cit., p. 268 ; Matsumoto, loc. cit., p. 160. 

 Numerous specimens ; off Ayukawa, 17 fathoms. Numerous speci- 

 mens ; S. E. S. of Enoshima, N. from Kinkwasan ; 43 fathoms. 



4 Ophiophragmus japonicus Matsumoto. 

 Clark, loc. cit., p. 239 ; Matsumoto, loc. cit., p. 183. 

 Numerous specimens ; off Oginohama, as already reported by me. 



5. Amphipholis pugetana (Lyman). 



Clark, loc. cit., p. 242; Matsumoto, loc. cit., p. 191. 

 One specimen ; S. E. S. of Enoshima, N. from Kinkwasan ; 43 

 fathoms. 



So far as known, this locality is the southern limit of the present 

 species along the western border of the North Pacific. 



6. Ophiothrix marenzelleri Kœhler. 

 Clark, loc. cit., p. 273 (O. hylodes) ; Matsumoto, loc. cit., p. 273. 

 One specimen; off Ayukawa; 17 fathoms. 



7. Stegophiura sterea (Clark). 

 Clark, loc. citr, p. 317; Matsumoto, loc. cit., p. 258. 

 Numerous specimens ; S. E. S. of Enoshima, N. from Kinkwasan ; 

 43 fathoms. Two specimens ; S. E. E. of Kinkwasan ; 104 fathoms. 



