I 



Plate 6. First-Stage Lobster. 



Figure 8. Right cheliped from behind and above, M=37. The strong 

 functional exopodite (ex) is attached to the basipodite. The endopodite, which is 

 terminated by a non-functional claw, is comparatively weak, and the end of the 

 propodite is much shorter than the opposing dadylopodite. The gills (podo- 

 branchs) are attached to the coxopodite. At this stage there is no differentia- 

 tion in the two chelipeds of the lobster. The characteristic "nipping" and 

 "crushing" claws do not appear until the sixth stage. Until that stage, both 

 claws are alike. The dactyls open upward in a vertical plane and somewhat 

 outward. In the first stage there are no "teeth" on the dactylopodite or propo- 

 dite. 



