MONOGRAPH OP JAPANESE OPHIUROIDEA. 



41 



Euryala aspera : Döderlein, Abh. Matli.-Phys. Kl. K. Bayer. Akad. 

 Wiss., Suppl.-Bd. I, 1911, p. 65 & 98, fig. 16, PL V, figs. 7 & la. 



One specimen ; Okinawa. 



Eastern and western Australia. Malaysian waters. Philippines. 

 Gulf of Siam. Southern China. 



This specimen is 

 very small, being only 

 4 mm. in the disk 

 diameter. The arms 

 are branched about 

 eight times, and are 

 about 27 mm. in total 

 length. At the cen- 

 tral region of the disk, 

 six very small, rather 

 inconspicuous primary 

 plates are present. 

 Each radial rib bears 

 near its outer end one 

 large, cylindrical, blunt 



tubercle joined by a movable articulation. A grain is present in 

 the radial line somewhere between each pair of the tubercles. 

 Further, some of the arm joints bear each one short, cylindrical, 

 blunt tubercle joined by a movable articulation. Such a tubercle 

 never lies in the median line, but in such a position as to suggest 

 that it is one of a pair, of which the fellow is absent. 



Fig. 9. Euryale aspera. a. From above. x2. 

 h. From belo'«'. x 10. 



JEurydle anopla Clark. 



EunjaU anopla: Clark, Bull. U. S. Nat. Mus., LXXY, 1911, p. 294, 

 fig. 144. 



