Fig. 59. — viStacMS fluviatilis.—VentTaX (A, B, C, F) and lateral (D, E) \'ie\vs of the 

 embrj'O in successive stages of development (after Kathke, x 16). A is a little mure 

 advanced than the embryo represented in tig. 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 ceiihalic and 

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

 of the first maxillipede ; (jg, green gland; k, heart; Ih. labrum ; /r, liver; m, 

 mandibular muscles. 



