MONOGRAPH OF JAPANESE OPHIÜROIDEA. 273 



In these Japanese specimens, the primary plates are rather 

 small and have a flat surface, so that the disk is very smooth. 



The plates and scales of the disk, as well as the arm plates, 

 are Hght gray, with whitish peripheries. In one specimen, the 

 primaries are especially dark, so that the disk appears spotted. 



Ophiura flagellata (Lyman). 



OpMoglyplia flagellata : Lyman, Bull. Mus. ,Comp. Zool., V, 1878, p. 

 69, PI. n, figs. 49-51 ; Lyman, Eep. Challenger, V, 1882, p. 52, PI. IV, 

 figs. 16-18 ; Kœhlee, Aud. Sei. Nat. Zool., Ser. 8, IV, 1896, p. 299 ; Kœhler, 

 Ech. Indian Mus., Deep-sea Oph., 1899, p. 18 ; Kœhler, Exp. Siboga, XIV, 

 Pt. I, 1904, p. 56 ; Kœhler, Mém. Soc. Zool. Fr., XIX, 1906, p. 6 ; Kœhler, 

 BuU. Sei. Fr. Belg., XLI, 1907, p. 294 ; Kœhler, Exp. Sei. Travailleur et 

 Talisman, Vni, 1907, p. 261. 



Gymnopliiura cœridescens : Lütken & Mortensen, Mem. Mus. Comp. 

 ZooL, XXni, 1899, p. 114, PI. VII, figs. 4-6. 



OpJiiura flagellata : Clark, Bull. U.S. Nat. Mus., LXXV, 1911, p. 60, 

 fig. 15. 



Three specimens ; Okinosé, off Misaki ; 100 fathoms. 



Uraga Channel; 70-302 fathoms (Claek). Sagami Sea; 292- 

 405 fathoms (CLAPtx). Off Piiknzen, eastern Japan ; 182 fathoms 

 (Clark). Off Omai Zaki ; 475-505 fathoms (Claek). Eastern Sea ; 

 361 fathoms (Claek). 



Bering Sea and off Alaska (Claek). Indian Ocean and Malay- 

 sian waters (Kœhlee). South-eastern Atlantic (Kœhlee). 



The arm spines are much flattened, the lowest one being 

 more or less spatulate. The second oral tentacle pore opens in 

 the oral slit, with four or five abradial and three or four adradial 

 scales, the former showing a tendency to form a continuous series 

 with the oral papillœ. There are three adorai scales to the first 



