40 



and branching at each end in two simple processes, of which the lower- 

 most is the longer (Fig. 8 A). Regarding the color of the larva I have 

 noticed that red pigment cells occur scattered in the body (the small 



po 



ep 



Fig. 8. Larva of Lytechinus anamesux, ,'50 clays old. 

 Drawn from life. A. from the ventral side; B. side 

 view; C. seen from above. Fig. A and B showing 



only the lower part of the larva. 



a. anus; al. antcrolateral arm; ep. epaulel; 



oe. esophagus; pd. posterodorsal arm; po. postoral 



arm; pr. preoral arm; ptr. posterior transverse 



rod; re. rectum; st. stomach. 



round spots seen in PI. VIII. Fig. 4); in the grown larva such pigment 

 cells are found especially along the epaulets and in the point of the 

 arms. 



The point to emphasize on comparing the larvae of these two species, 

 L. iHiricyaliifi and anamesus, is the presence of large, strongly developed 

 epaulets in the latter, while such appear to be entirely absent in the 

 former; at least their presence in this species needs to be verified. Other- 

 wise they agree in their main features, and it is especially important 

 to notice the close conformity of their skeletal structures, in both the 

 first and the second larval stages. 



