BuLt. U. S. B. F., T909. 



Plate XXX. 



. i 



Fi'4. 



Fig. ^. 



Fig. I. — Growth stages of lobster eggs and young to illustrate relative sizes attained at 'Woods Hole, 

 Massachusetts, a, ovarian ova in June; h, external egg in invagination stage, July; c, egg-embryo, 

 September i; d, embryo, March 1. In this and following figures, all represented, in full size 

 from alcoholic materials. 



Fig. z. — Growth stages of young lobsters continued, e. Embryo at hatching (July); i (first line), 

 first larva, not free from first molt; i (second and third lines), first free larval stage; 2, second 

 larva; j. third larva; 4, fourth stage. 



Fig. 5.— Growth stages of the lobster continued. 4. Fourth stage; ? and 6, fifth and sixth stages, 

 respectively. 



