132 ART. 2. — H. MATSUMOTO : 



Opliiocamax polyploca CJlark. 



OpUocamax pdlyploca : Claek, Bull. U. S. Nat. Mus., LXXY, 1911, j). 

 193, %. 90. 



Eastern Sea; 95-152 fathoms (C'lakk). Kagoshima Gnlf ; 85 

 fathoms (Claek). 



Key to Japanese species of OpJtioiebes, 



A— Four oral papillge od either side of each jaw ; ventral arm plates 

 not notched outwards at least within the disk ; seven arm spines ; 

 single tentacle scale to each pore ; disk beset with numerous small, 



rather well spaced, stumpy tubercles hrachygnatha. 



AA — Three oral papillae on either side ; ventral arm plates distinctly 

 notched outwards even witliin the disk ; five arm spines ; tentacle 

 scales absent. 

 a — Disk closely beset with very numerous small, rather granule-like, 



stumpy tubercles asaphes. 



aa — Disk sparsely beset with rather large, conical tubercles, which are 

 more or less numerous on the radial shields, but few in the other 

 parts tnherosa. 



OpJiiolebes brachygnatha Clark. 



OpMolehes hrachygnatha : Clark, Bull. U. 8. Nat. Mus., LXXY,^1911, 

 p. 240, fig. 115. 



Off Simushir Is.; 229 fathoms (Clark). 



Ophiolehes asaphes Clark. 



OjoMokhes asaphes: Clark, Bull. U. 8. Nat. Mus., LXXV, 1911, p. 

 239, fig. 114. 



OffKinkwasan; 182 fathoms (Claek). Off Hokkaido ; 175- 

 349 fathoms (Clark). Off Saglialin ; 100 fathoms (Claek). 



