502 



MAVOR. 



mesenteries as far as section 80 on the right and on the left up to sec- 

 tion 83. They are largest (Fig. 4, F) on the right between sections 

 87 and 108 and on the left between sections 87 and 1 10, where they are 

 larger than any of the transverse sections of the filaments of the second 

 pair of mesenteries. The mesenterial filaments of the second pair of 

 mesenteries extend on the right into section 89 and on the left (Fig. 

 4, F) into section 95. The transverse sections of these filaments 

 (Fig. 4, E) are largest on the right between sections 54 and 87 — where 



© ® 



Figure 4. Agaricia fragilis. Larval. Transverse sections of larva, the 

 oral end having been cut first. Dorsal being up, the right of the larva is to 

 the right in the figures. Ectoderm and mesoglea colored black. A, B, C, D, 

 E, F, sections number 15, 19, 23, 2.5, 73, 93 respectively. In C, I, II, III, 

 IV, V, VI mark the first, second, third, fourth, fifth, and sixth pairs of mes- 

 enteries. X 90. 



up to section 80 they are larger than the filaments of the first pair 

 of mesenteries in the same sections, — and on the left between sections 

 58 and 90, where they are larger than the filaments of the first pair of 

 mesenteries as far as section 83. The filament of mesentery /// on 

 the right side of the larva (left in the preparation) is not continuous 

 with the ectoderm of the oesophagus, being absent in sections 20 to 26. 

 On the left side of the larva the filament of the corresponding mesen- 

 tery if present at all is reduced to a few scattered cells in these sections. 

 Both filaments are enlarged beyond these sections but are always much 



