220 



THE MORPHOLOGY OF THE COMaiON CRAYFISH. 



processes, and the disposition of tlie vascular canals in its 

 interior gives it the appearance of being radially striated. 

 The setae, so abundant in the adult, are very scanty in 

 the newly hatched young; and the great majority of those 

 wliicli exist are simple conical prolongations of the un- 



"■^, 



Fig. 60. — Axtacns fliivkdUis. — Xewly-hatched young ( x G). 



calcified cuticle, the bases of which are not sunk in pits 

 and which are devoid of lateral scales or processes. 



The young animals are firmly attached to the ab- 

 dominal appendages of the parent in the manner already 

 described. They are verj^ sluggish, though they move 

 when touched ; and at this period they do not feed, but 



