:\[ON(XiEArH or Japanese ophiukoidea. 



179 



dA — Four arm spines ; single tentacle scale ; radial sliielcls very small, 

 widel}' separated from each otlier ; disk spines i^ot very mimerous, 

 very short, blunt, present only on the dorsal side d'lvidua. 



Amphiacantha forniosa (Lütken). 



Opldostigma fonnosa : Lütken, Oph. Nov., 1872, p. 3, PI. I-II, figs. 

 ^a k, 55 ; Lyman, Rep. Challenger, V, 1882, p. 166 ; Ivehler, Bull. Sei. 

 Fr. Belg., XXXI, 1898, p. 76; Ivœhler, Ees. Exp. Siboga, XLV, Pt. 2, 

 1905, p. 24, PI. n, fig. 1. 



Strait of Formosa (Lütken). 



Indian Ocean and Malay.sian waters. 



As far as I can judge from Lütken's description and figures, 

 this species is evidently not referable to OphiosUgma, having four 

 oral papilla?, of which the outermost one is very small and rudi- 

 mentary, cjuite as in the next 

 species. 



Aiupft iacff nth a acantftina 



(Clark). 



Ampliioplus acanfMnus: Clark, 

 Bull. U.S. Nat. Mus., LXXY, 

 1911, p. 168, fig. 75. 



Two specimens ; Uraga 

 Channcd ; 140 fathoms. 



Off Tsurugi Saki; 110- 

 259 fathoms (Claek). Suruga 

 Gulf; 148 fathoms (Claek). 



The disk scales are fine 

 and re^'ular in one of the 



Fig. 46. Amphiacantha acanthina. x5. a. 

 From above, h. From below, c. Side view 

 of three arm joints near disk. 



