252 



Doliolaria 



Formed on the third day of development, the doliolaria is 650 jim long. 

 Its entire body is covered with cilia and is tinted green. No ciliated bands 

 were observed, which are typical of the larvae of other holothurians of this 

 family. The oral opening is situated in the anterior third of the larva. A yolk 

 accumulation at the animal pole in the preoral lobe tints this part of the larva 

 dark green (Figure 197A). 



Figure 197. Cucumaria japonica. 



A — doliolaria; B — early pentactula; C — pentactula; D — madreporite; E — plate of the 



perioral calcite ring; F — plates of the ambulacral podia. 



Pentactula 



The early pentactula may not differ in size from the doliolaria but the 

 green tinge diappears except in the preoral lobe. In a dorsal view of the larva 

 the primary tentacles and two ambulacral podia of the medioventral canal are 

 visible. At this stage, these are still immobile. In the late pentactula stage the 



