PLATE LXIII. 



Sergestes (?) — Development. 



Platysacus crenatus (p. 363). 

 Fig. 1. Dorsal view ; enlarged seventy times. 

 „ 2. Rostrum of carapace and of epistoma. 

 „ b. First antenna. 

 „ c. Second antenna. 

 „ i. Second gnathopod. 



