Plate 26. Fourth-Stage Lobster. 



Figure 36. Right first antenna from above, M = 30. In the fourth stage 

 the inner branch, or endopodite, is distinctly segmented and is slightly longer than 

 the exopodite, which is also distinctly segmented and bears along the inner edge 

 the olfactory setae. Throughout the life of the lobster the outer branch remains 

 larger and stouter than the inner. 



Figure 37. Right second antenna from above, M = 15. The cramped 

 segments of the endopodite which were shown in Fig. 24, PL 16, have expanded 

 to form a long lash, while the exopodite has degenerated to an equal extent. 



