THE EEPRODUCTION OF LIMBS. 37 



fluttered about in the greatest agitation. He was quite 

 soft ; and every time I entered the room during the next 

 two days, he exhibited the wildest terror. On the third, 

 he appeared to gain confidence, and ventured to use his 

 nippers, though with some timidit}^, and he was not yet 

 quite so hard as he had been. In about a week, how- 

 ever, he became bokler than ever ; his weapons were 

 sharper, and he appeared stronger, and a nip from him 

 was no joke. He lived in all about two years, during 

 which time his food was a very few worms at very uncer- 

 tain times ; perhaps he did not get fifty altogether."* 



It would appear, from the best observations that have 

 yet been made, that the young cray^fish exuviate two or 

 three times in the course of the first year ; and that, 

 afterwards, the process is annual, and takes place usually 

 about midsummer. There is reason to suppose that very 

 old crayfish do not exuviate every year. 



It has been stated that, in the course of its violent 

 efforts to extract its limbs from the cast-oif exoskeleton, 

 the crayfish sometimes loses one or other of. them ; the 

 limb giving way, and the greater part, or the whole, of it 

 remaining in the exuviae. But it is not only in this way 

 that crayfishes part with their limbs. At all times, if the 

 animal is held by one of its pincers, so that it cannot 

 get awa}^ it is apt to solve the difficulty by casting off 



* The late Mr. Robert Ball, of Dublin, in Bell's " British Crustacea," 

 p. 239. 



