220 THE MORPHOLOGY OF THE COMMON CRAYFISH. 
processes, and the disposition of the vascular canals in its 
interior gives it the appearance of being radially striated. 
The sete, so abundant in the adult, are very scanty in 
the newly hatched young; and the great majority of those 
which exist are simple conical prolongations of the un- 
Fie. 60.— Astacus fluviatilis —Newly-hatched young (x 6). 
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 very sluggish, though they move 
when touched ; and at this period they do not feed, but 
