Plate 33. Fourth-Stage Lobster. 



Figure 46. Bight second walking leg from behind, M=23. The walking 

 legs of the fourth-stage lobster have elongated. The exopodite is reduced to a 

 rudiment, still attached to the basipodite, but non-functional. The claw has now 

 reached nearly the adult structural type, but the dactyl, which in the chelipeds 

 underwent a torsion through about 90 degrees, still opens upward and slightly 

 outward. The podobranchs have further developed, and coxopoditic settr are 

 present. 



Figure 47. Right third walking leg from behind, M = 23. Except for the 

 spike-like dactyl, the conditions are the same as in the case described above. 



