VII 



DEVELOPMENT 



385 



FIG 09 Early embrvo of the Cra>-iish in the nauplius stage. ( x about 20.) 

 A in the upper part of the figure is the eye ; /. the labrum overhanging the mouth, 

 on either side of which are the rudiments of the antennules (.), antenna (a-.), 

 and mandibles (m.) ; behind them is the rudiment of the thorax and abdomen 

 (TA) with the anus (.4). The rudiments of the first three pairs of ganglia 

 (G, ga*, gm) are seen through the transparent ectoderm. (From Lang s Comp. 

 Anatomy, after Reichenbach.) 



FIG. 100. Nauplius larva of Water-flea (Cyclops), (x about 20.) 



a, b, c, the three pairs of swimming appendages, representing the antennules, 

 antennae, and mandibles of the Crayfish ; the median eye is seen between the 

 bases of the first pair. (From Gegenbaur's Camt>. Anatomy.) 



