ON A COLLECTION OF OP1IIURANS FROM KINKWASAN. 



479 



8. Stegophiura sladeni (Duncan). 



Clark, loc, cit., p. 317; Matsumoto, loc. cit., p. 259. 



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

 43 fathoms. Numerous specimens ; S. W. S. of Enoshima, N. from 

 Kinkwasan; 31 fathoms. 



9. Ophiura sarsii Lütken. 



Clark, loc. cit., p. 323 ; Matsumoto, loc. cit., p. 272. 



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

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

 specimens ; S. W. S. of Enoshima, N. from Kinkwasan ; 3 1 fathoms. 



10 Ophionereis eurybrachiplax Clark. 



Clark, loc. cit., p. .^89 ; Matsumoto, loc. çit., p. 336. 



Three specimens ; E. of Kinkwasan ; 43 fathoms. 



In the very rudimentary condition of the supplementary dorsal 

 arm plates, the present species stands nearest to Ophiodoris, of all the 

 known species of Ophionereis. The same holds true also of certain 

 internal structures. The peristomial plates are double, the common 

 outline of the oral and dental plates in dorsal view is II-shaped and 

 the teeth are quadrangular, quite as in the majority of the Ophionereidince. 

 The lateral wings of the oral frames are of course well developed, and 

 better developed than in Ophiodoris pericalles Clark (Matsumoto, 

 loc. cit., pl. VI, figs. 10 and 11), but less so than in Ophionereis 

 annidata Le Conte (ditto, pl. VII, fig. 1), O. reticulata Lütken 

 (ditto, pl. VII, fig. 2) and Ophiocrasis marktanneri MATSUMOTO (ditto, 

 pl. VII, fig. 3). The shortest one of the basal vertebrae is not the 

 first as in Ophiodoris, but the second as in the other Ophionereis and 

 in Ophiocrasis. The dorsal side of the vertebrae of the free arm joints 

 is notched inwards more strongly than in Ophiodoris, but much more 

 feebly than in the other Ophionereis and in Ophiocrasis. In short, so 

 far as these characters are concerned, the present species stands between 



