Fig. 59.—^stacus flnviatiUa.—YentraX (A, B, C, F) ami lateral (D, E) views of the 

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

 advanced than the embryo represented in fig. 58, F : D, 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. 1 — 14, the cephalic and 

 thoracic appendages ; ah, abdomen ; br, branchiae ; c, carapace ; ep, epipodite 

 of the first maxillipede ; r/jf, green gland; h, heart; lb, labrum ; Ir, liver; m, 

 mandibular muscles. 



