THE DEVELOPMENT OF MYSIS. 



305 



Fig. 79.— Continued. 



14.Z0 



Fig. 79.— The development of My sis. — A, Bide view of an egg, in which the blasto- 

 derm has just appeared. _B, side view further advanced. <7, front view of embryo 

 at the same age, showing the procephalic lobes, here marked b. Z>, larva, ventral 

 view. £J, side view. (These two figures have been inverted by the engraver.) 

 F, young pupa. £, further advanced. H, young Mysis, which has left its pupa 

 skin. I, anterior portion of the same, enlarged, and with the carapace thrown 

 back, a, vitelline membrane ; b, yelk ; c, central depression of the blastoderm ; 

 d, procephalic lobes ; /, larval integument ; g, its caudal enlargement ; h, cara- 

 pace. 1, 2,3, 4, etc., the somites and their appendages, numbered from before 

 backward. 



