Plate 32. Fourth-Stage Lobster. 



Figure 45. Right cheliped seen from above and in front, M = 1.5. Here is 

 observed the culmination of the process of torsion which began in the second 

 stage. The dactyl of the claw now opens inward horizontally, not vertically 

 upward, and slightly outward as in the first-stage larvae. Tactile hairs are shown 

 on the propodite and on the dactyl. The non-functional rudiment of the exopo- 

 dite is seen still attached to the basipodite. The coxopoditic setoe show above 

 the podobranch, which together with the epipodite is developed beyond the point 

 of the third stage. 



