Miastor ? americana Felt 



1 A portion of a segment of the larva illustrated on plate 35, figure i show- 

 ing the character of the large-celled median mass of mesoderm, x 200 



2 Embryo illustrated on plate 32, figure i. x 300 



3 Enlargement of same embryo from photograph made the following day. 

 X 300 



170 



