154 ART. 2. — H. MATSUMOTO : 



ee — Six arm spines in free basal arm joints ; dorsal arm plates less 

 than, or nearly, twice as wide as long; two or three oral papillae 

 on either side. 



y — ^Adorai shields meeting with each other both in the radial and 

 interradial lines ; interbrachial ventral sm-faces covered with fine 

 scales savigiujL 



ff — Adorai shields not meeting with each other either in the radial or 

 interradial lines ; interbrachial ventral surfaces covered by a naked 

 skin gymnocliora. 



Opliiactis hracJiygenys Clark. 



OpUactis hrachygenys : Clark, Bull. U. S. Nat. Mus., LXXV, 1911, p. 

 135, fig. 51. 



Off Manazaru Zaki, Sagami Sea; 120-265 fathoms (Clark). 

 Off Hiuga; 437-720 fathoms (Claek). 



Ophiactis pteropoma Clark. 



OpUactis pteropoma ': Clark, Bull. U. S. Nat. Mus., LXXV, 1911, p. 

 134, fig. 50. 



One specimen; Misaki. 



Sea of Japan ; 195 fathoms (Clark). Off Kii ; 191-253 fathoms 

 (Clark). 



This species appears to me to be very near to 0. profondi 

 LüTKEN à MoRTENSEN, 1899, differing from it merely in the arm 

 spines being unequal instead of being subequal. 



Ophiactis dyscrita Clark. 



Opliiactis dyscrita : Clark, Bull. Ü. S. Nat. Mus,, LXXV, 1911, p. 137, 

 fig. 52. 



A , 



Six specimens, clinging to a hexactinellid sponge ; off Oshima, 

 Sagami Sea ; 75-85 fathoms. 



