MONOGRAPH OF JAPANESE OPHIUEOIDEA. 259 



Uraga Channel, 70-88 fathoms (Claek). Suruga Gnlf; 124 

 fathoms (Clark). Off Kii ; 191 fathoms (Claek). Sea of Japan ; 

 70-114 fathoms (Clakk). Off Korea; 82 fathoms (Clark). Off 

 Honshu ; 57-81 fathoms (Clark). 



The primary arm spines stand out more or less at right angles 

 to the arm axis, and are conical and longer and stouter than the 

 secondary ones ; they are five in the free 

 basal arm joints. The secondary arm spines 

 are very fine, conical, rather well spaced, nine 

 to eleven in number in the free basal arm 

 joints. Both the primary and secondary arm ^.^ ^^ stegophmra 

 spines diminish in number outwards, the latter •'»■^ere«, side view of 



an arm base, x 8. 



more rapidly, so that there are only three 



primary and no secondary spines in the distal arm joints. 



StegopJiiiirci sladeni (Duncan). 



OphioglypJia sladeni : Duncan, Jonrn. Linn. Soc. London, XIV, 1879, 

 p. 458, PI. IX, figs. 9-11; Lyman, Rep. Challenger, V, 1882, p. 77. 



OpUura stiphra : Clark, Bull. U. S. Nat. Mns., LXXV, 1911, p. 82, 

 fig. 25. 



Numerous specimens ; Okinosé (a submarine bank), Sagami 

 Sea ; 83 fathoms. Numerous specimens ; Uraga Channel ; 35 

 fathoms. 



Off Osé Zaki, Suruga Gulf; 65-125 fathoms (Clark). Off 

 Kagoshima Gulf; 103-152 fathoms (Clark). Korea Strait; 66 

 fathoms (Clark). Sea of Japan ; 44-47 fathoms (Clark). Off 

 Honshu ; 45-70 fathoms (Clark). 



The primary arm spines are erect, conical, acute, three in 

 number, one just above the uppermost secondary spine, one just 

 above and the other just below the lowest secondary spine, which 



