130 



This species was met with only at Jolo in March 1914; there are 4 spec- 

 imens. Unfortunately it was not observed alive, so that the color of the 

 pigment is uncertain, but it looks in the preserved specimens very much 

 like the black pigment of the 0. fragilis-larva. 



Species d. (PI. XIX, Fig. 7). Although in its main characters in con- 

 formity with the general type of the Ophiothrix-larvve this species is mark- 

 edly distinguished from the other species of this type by several characters. 

 The postoral and posterodorsal arms are not much more than half body 



Fig. 56. Skeleton of Ophiopluteus of Ophiothri.r, species d. 2! %. Letters as in fig. 55. 



length, the anterolateral arms even shorter, only about l /:-, of the body 

 length; the posterolateral arms are three times the length of the body. 

 All the arms have a distinct widening at the point. The body is wider 

 than usual, corresponding to the unusual length of the body rods. The 

 skeleton (Fig. 56) differs from that of the usual Ophiothrix-type, besides 

 in the great length of the body rods, in the distinct curvature at the point 

 where the rods of the arms issue. The postoral and the anterolateral rods 

 have some rather coarse thorns, and also the posterolateral rods are more 

 closely thorny along their innerside than is the rule in other Ophiothrix- 

 larvse. The anterolateral rods also show a characteristic angular curve 

 below the point of issue of the posterodorsal rod, from there proceeding 

 straight on to somewhat above that point, where it then once more fairly 

 abruptly bends. 

 The inner structure was indiscernible in the single specimen in hand, 



