FIG. 115. Older embryo of the crayfish. A, eyes; 

 ai, antennules ; a-i, antenna ; ab, abdomen ; /, up- 

 per lip; w, mandible; w.n, mx**, first and second 

 maxillae ; T, telson ; /;, /g, thoracic limbs ; h, ts, 

 maxillipedes ; /4, /8, walking legs. (From Korschelt 

 and Heider after Reichenbach.) 



