MONOGRAPH OF JAPANESE OPHIUEOIDEA. 171 



Ampliioplus rhadinohvacliius Clark. 



AmpJdura sp.: Lütken & Mortensen, Mem. Mus. Comp. Zool., XXITE, 

 1899, p. 158, PI. Xin, figs. 1-3. 



Ampldoplds rhadinohracliius : Clark, Bull. U. S. Nat. Mus,, LXX"V 

 1911, p. 169, fig. 74. 



Niimerons specimens ; Okinosé (a submarine bank), Sagami 

 Sea ; 85 fathoms. 



Sagami Sea ; 369-405 fathoms (Claek). Suruga Gulf ; 282- 

 503 fathoms (Clakk). 



In the larger specimens, the interbrachial ventral surfaces are 

 almost naked, though in the smaller ones they are distinctly 

 squamated, as shown in Claek's figure. Lütken & Moetensen's 

 species, which was not named because the disk was wanting, 

 agrees very well with the present species. Many of my specimens 

 also lack the whole dorsal side of the disk. 



Amphioplus ancistvotus (Claek). 



AmpJdodia ancistrota : Clark, Bull. U. S. Nat. Mus., LXXV, 1911, p. 

 161, fig. 69. 



Numerous specimens ; Okinosé (a submarine bank), Sagami 

 Sea; 85 fathoms. Two si^ecimens ; Yahagi-gaké, ofFMisaki, Sagami 

 Sea; 310 fathoms. 



Uraga Channel; 70-197 fathoms (Claek). Off Manazuru Zaki, 

 Sagami Sea; 153 fathoms (Claek). Off Osé Zaki, Suruga Gulf; 

 45-65 fathoms (Claek). Off Kii, Kitan Channel; 191 fathoms 

 (Claek). Sea of Japan; 61 fathoms (Claek). 



In my specimens, the radial shields are narrower and less 

 divergent than in Claek's type. The oral shields are rhomboidal 

 and longer than wide, but variable. On either side of the oral 



