MONOGRAPH OF JAPANESE OPHIUROIDEA. 



39 



palmiferus, at least in the adult, are entirely absent in my specimens. 

 DoDERLEiN states that, the part of the arm within the first bifurca- 

 tion is composed of about sixty-two joints in T. palmiferus, wliile 

 in my specimens, that part is composed of from forty-three to 

 forty-five joints, except in an arm of one of the specimens, in which 

 that part is composed of fifty-three joints. Ludwig makes no state- 

 ment on this point, but in his fig. 1, about forty-six joints are 

 indicated in the part in question. This number almost agrees 

 with what obtains in my specimens, but is very far from that 

 given by Düderlein. Bomford records thirty -nine to fifty -two 

 joints in the part in question. So I must agree with Bomford in 

 recognising the present species as distinct from 2\ palmiferus. 



In one of my two specimens, the disk is 33 mm. in diameter, 

 and the arms are divided six times and about 310 mm. in total 

 length. In the other specim,en, the disk is 32 mm. in diameter, 

 and the arms are divided five or six times and about 290 mm. in 

 total length. As to the ratio of the width to height of the arms 

 the two specimens stand in striking contrast, as shown in the 

 followincc table. 



The generative glands extend into the arms as four pairs of 

 ribbon-shaped bodies for each arm. Microscopical examinations of 

 the generative glands showed that, the larger one of the two 

 specimens was male and tlie smaller one female. The testicular 



