PLATE III. 



Figs. 11, 12, 13. 14, show increased numbers of tentacles, pedicels, and 

 papillae. The terminal branches of the tentacles are well marked. 



Fig. 11. Ventral view of larva of fifty-three days. In addition to the five 

 primary tentacles, the sixth, seventh, eighth, ninth, and tenth, tentacles are 

 shown. Four pedicels and three buds are now found on each side of the mid- 

 ventral radial canal, forming a more or less zigzag line. Five developed pedicels 

 and one bud arise ventrad from each lateral ventral radial canal. X 17^. 



Fig. 12. Dorsal view of larva represented in Fig. 11. The two posterior 

 pairs of dorsal papillae have grown larger. An anterior pair of papillte is 

 developed dorsad from the right and left dorsal radial canals. X nV2- 



Fig. 13. Ventral view of larva of seventy-live days, showing the additional 

 thirteenth tentacle (LDd 2) and only a slight increase in the number of pedi- 

 cels and buds over the fifty-three day holothurid. The mouth is well shown. 



X 141/0. 



Fig. 14. Dorsal view of larva represented in Fig. 13. The anus and anal 

 plates are prominent. X 14%. 



