FIG. 113. Surface of a crayfish egg with embryo be- 

 ginning to form. ES, entodermal plate ; K, optic 

 lobes ; TA , thoraco-abdominal plates. (From 

 Korschelt and Heider after Reichenbach.) 



FIG. 114. Embryo of the crayfish in the Nauplius stage. 

 A, rudiment of eye; ai, antennule ; 02, antenna; 

 G, cerebral ganglion ; m, mandible ; /, upper lip ; 

 TA , thoraco-abdominal plate ; A , anus. (From 

 Korschelt and Heider after Reichenbach.) 



