MONOGRAPH OF JAPANESE OPHIUROIDEA. 



275 



Ophiuva quadrispina Clark. 



OpMiira quadrispina: Clark, Bull. U.S. Nat. Mus., LXXV, 1911, p. 

 55, fig. 13. 



Okhotsk Sea; 109-188 fathoms (Claek). Yezo Strait; 533 

 fathoms (Clark). Sea of Japan ; 325-428 fathoms (Clark). 



Berincr Sea. Alaska. 



Ophiura oöplax (Clark). 



Opkiocfen oöplax : 

 Clark, Bull. U. S. Nat. 

 Mus., LXXV, 1911, p. 

 99, fig. 37. 



One specimen ; 

 Albatross station 

 (number ?). 



Off Honshu; 94- 

 507 fathoms (Clark). 

 Sagami Sea ; 292- 

 614 fathoms (Clark). 

 Eastern Sea ; 369- 

 440 fathoms (Clark). 



In my opinion, 

 this species is evi- 

 dently a typical 

 Ophiura, though 

 Clark has referred 

 it to Opliiocten. In 

 the genuine Opliioc- 

 ten, the tentacle pores 



Fig. 75. Ophiura oöplax. xl5. a. From above, h. From 

 below, c. Side view of two arm joints near disk, cZ. 

 Dorsal view of two arm joints somewhat near disk. 



