MONOGRAPH OF JAPANESE OPHIUROIDEA. 263 



e. — Single arm spine ; tentacle scales present on both sides of the pore ; 

 oral angles free of granules peniclira. 



ee. — Four or five arm spines ; tentacle scales present only on the inner 

 abradial border of the pore ; oral angles often beset with a few 

 granules megapoma. 



dd. — Oral shields very narrow ; arm spines very numerous, squarish, flat, 

 close-set ; genital papillœ present also on the outer abradial border 

 of the adorai shield ; disk plates convex and lumpy ponderosa. 



cc. — Comb papillse spiniform, acute, well spaced, though they become 



shorter, wider, blunter and more close-set downwards. 

 /. — Disk covered with numerous small scales besides the primaries, 

 which are separated from one another; oral shields rounded pen- 

 tagonal, with a very acute inner angle ; five well spaced arm 

 spines sculptilis. 



ff. — Disk covered with a few secondary plates besides the primaries, 

 which form a central rosette ; oral shields trefoil-shaped ; thirteen 

 or fourteen arm spines lopidaria. 



A'inpJiiojyhiura convexa (Lyman). 



OpUoglypha convexa: Lyman, Bull. Mus. Comp. Zool,, V, 1878, p. 84, 

 PI. m, figs. 83 & 84 ; Lyman, Eep. Challenger, V, 1882, p. 58, PI. VI, 

 figs. 13-15; Lyman, Bull. Mus. Comp. Zool., X, 1883, p. 243, PI. IV, figs. 

 40-45; Kœhlee, Bull. Sei. Fr. Belg., XLI, 1907, p. 293; Kœhler, Res. 

 Camp. Sei. Monaco, XXXIV, 1909, p. 149, PI. XXV, figs. 1 & 2 ; Kœhlee, 

 Bull. U. S. Nat. Mus., LXXXIV, 1914, p. 12. 



Western North Pacific (type locality) ; 2,050-2,300 fathoms 

 (Lyman). 



Off western Africa. Caribbean Sea. 



AtnphiopMura œdiplax (Clark). 



OpUnra œdip>lax : Clark, Bull. U. S. Nat. Mus., LXXV, 1911, p. 74, 

 fig. 21. 



