MONOGEAPH OF JAPAî^ESE OPHIÜEOroEA. 119 



Bering Sea. Arctic Ocean. North Atlantic. 



Opliiaeantha prionota Claek. 



Opldacantha prionota : Claek, Bull. U. S. Nat. Mus., LXXV, 1911, p. 

 213, fig. 99. 



Off Tanega-shima ; 1,008 fathoms (Clark). 



Ophiacantha diploa Claek. 



OpJdaeantha diploa: Claek, Bull. U. S. Nat. Mus., LXXV, 1911, p. 207. 

 Off Hiuga ; 437 fathoms (Clark). 



OpMncantha rhachophora Clark. 



Ophiacantha rhachophora : Claek, Bull. U. 8. Nat. Mus., LXXV, 1911, 

 p. 201, %. 92. 



Four specimens ; off Inatori, Izn. 



Eastern Sea ; 106-139 fathoms (Clark). Off Omai Zald ; 475- 

 505 fathoms (Clark). Off Ose Zaki, Sm^nga Gulf ; 63-100 fathoms 

 (Clark). Sagami Sea ; 83-153 fathoms (Clark). Uraga Channel ; 

 197 fathoms (Clark). Off Kii ; 191-253 fathoms (Clark). Sea 

 of Japan ; 90-207 fathoms (Clark). 



Bering Sea. 



I hesitated at first to refer these specimens to the present 

 species. The distal end of the radial shields is naked but not 

 conspicuous, and the outermost oral papilla arises from the 

 adorai shield. Besides, there occurs one scale-like papilla on the 

 first ventral arm plate, projecting inwards and vertically. These 

 characters are not apparent in Clark's figure ; but it is to be 

 remarked that the insertion of the outermost oral papilla is very 

 liable to be misunderstood when the papilla is not turned up but 



