PLATE II. 



Figs. 7, 8, 9, 10 show the larval tables (t), the terminal branching of the 

 tentacles, the radial canals and the enterou, with its enlarged stomach and 

 three loops. 



Fig. 7. Ventral view of a larva of nine days showing the five primary ten- 

 tacles, the posterior mid-ventral first pedicel, and the second pedicel, developed 

 to the left from the mid-ventral radial canal. X 55. 



Fig. 8. A^entral view of a larva of thirty-three days, in which the five pri- 

 mary tentacles, the posterior pedicel, and the second, third, and fom'th pedicels, 

 to the left from the mid-ventral radial canal, are prominent. The first pedi- 

 cels from the right and left ventral radial canals have appeared. X 29. 



Fig. 9. Dorsal view of embryo represented in Fig. 8, showing the three 

 pairs of dorsal papillte. The first two, at the anterior end of the body, are 

 relatively large. The anus is guarded by two lateral, and one posterior, valves. 

 X29. 



Fig. 10. View from the right side of a larva of forty days, showing five 

 primary tentacles, the posterior pedicel, four well-developed pedicels to the 

 left from the mid-ventral radial canal, and the three dorsal papillae. In addi- 

 tion, the sixth tentacle, and the first pedicel to the right from the mid-ventral 

 radial canal are now developed. X 29. 



