498 



MAYOR. 



length of the endoderm of the larva. The following table shows their 

 positions and extent: 



Number of mesentery 

 Right side of larva 



II III 



IV 



Only mesenteries I to IV are complete. 



V VI 



Figure 2. Agaricia fragilis. Larva F. Transverse sections the oral end 

 having been cut first. The right of the larva is to the right in the figures. 

 Ectoderm and mesoglea colored black. A, B, C, D, E, F, G, H, I sections 

 number, 9, 13, 18, 21, 33, 45,61, 71, and 74, respectively. In E, I, II, III, 

 IV, V and VI mark the first, second, third, fourth, fifth, and sixth sections. 

 X90. 



