Fig. 59.— AStacns jttiviatilis.—Ventml (A, B, C, F) and lateral (D, E) views of the 

 embryo in successive stages of development (after Ratlike, x 15). ' A is a little more 

 advanced than the embryo represented in fig. 58, F : I), E, and F are views of 

 the young crayfish when nearly ready to be hatched : in E, the carapace is 

 removed, and the limbs and abdomen are spread out. " 

 thoracic appendages ; ab, abdomen ; Z>r r branchiae ; c, 

 of the first maxillipede ; gg, green gland; h, heart; lb, 

 mandibular muscles. 



1—14, the cephalic and 

 carapace ; ep, epipodite 

 labrum ; It, liver ; m, 



