MONOGRAPH OF JAPANESE OPHIUROIDEA. 



113 



Ophiacantha dallasH Duncan. 



OpJdacantha dullas'ii : Duncan, Journ. Linu. Soc. London, XIY, 1879, 

 p. 471, PL XI, figs. 2Ö-27 ; Lyman, Rep. Challenger, V, 1882, p. 199 ; 

 DÖDERLEIN, Semon-ZooI. Forscliungsr. Australien u. Malayisclien Archipel, V, 

 1896, p. 291, PL XrV, figs. 3a-3c, PL XVI, figs. 12-12a. 



Off Korea, Sea of Japan ; 50 fathoms (Duncan). 



Amboina (Dodeelein). 



Ophiacantha œnigmaticaf sp. uov. 



Seven specimens ; oft' Misaki, Sagami Sea. 



Diameter of disk 5 mm. Length of arms 25 mm. Width of 

 arms at base 1.2 

 mm. 



Disk penta- 

 gonal, with con- 

 cave interbrachi- 

 al borders, flat, 

 thin, covered by 

 a thick skin, con- 

 taining rather 

 fine, rounded, 

 thin, irregular 

 scales, which be- 

 come distinct 

 when dried ; 

 sparsely beset 

 with small 



stumpy tuber- 

 cles, WniCn are pjg_ 29. Ophiacanth'i œiùijinatlca. xl2. a. From aljove. b 

 bifid nv Pvnwn- From below, e. Side view of two arm joints near disk. 



