LEPTOSTRACA, SCHIZOPODA, DECAPODA. 



153 



Fio. 77.— Five embryos of Mysis (after Nusbaum). A, youngest Naujilins stage. B, older 

 Nauplius stage in profile. C, NaupUus after the disappearance of tlie vitelline membrane, 

 in tliree-iiuarters profile. D, later Nauplius stage with the Nauplius integument (n). E, 

 larva with thoracic limbs, a', first antenna; o", second antenna; c, vitelline membran 

 d, dorsal organ ; md, mandible; n, Nauplius integument] o, optic lobe ; ij, rudiment of the 

 compound eye ; s, caudal region. 



