Putnam.] 18 [May 5, 



it has not favored me with a change of skin. As before mentioned, 

 the young specimen of C. BartoniihdiS the same colors after shedding 

 its shell as before, and this milk white C. pellucidus has not changed 

 color after shedding its shell twice, and after living in full light of 

 day, and often for hours in the sunshine, for over five months. On 

 April 20, this same specimen cast its shell for the second time, and 

 within three months of the time it last moulted. During this period 

 it has not fed more than three or four times, and then only upon a 

 small quantity of food. 



The following gives the condition of the animal at the various 

 periods of its existence since it has been in my possession. 



November 13, captured the specimen, a female, in the waters of 

 Mammoth Cave. It was perfect in all respects except the right, 

 large claw, which was represented by a rudimentary one, entirely 

 useless to the animal, and so small as to be almost imperceptible. 

 Total length of the animal, when extended along a rule, and meas- 

 uring from tip of large claw to end of tail, not quite two and one-half 

 inches. 



November 14 to 24. During this period the crawfish had several 

 battles with the others in the same jar, and lost the larger part of 

 her antennae, the third, fourth and fifth legs from the left side, the 

 fifth from the right side and the two end joints of the third leg on the 

 right side. 



January 28 and 29. On one of these days she cast her shell and 

 came forth with a soft white covering, which was nearly two weeks 

 ! in hardening. Then all the legs, or claws, that were perfect before 

 were of the same size, but in addition the great claw of the right 

 side was developed to about one-half or two-thirds the size of its 

 fellow, and was apparently of as much use. The two missing joints 

 of the third leg on the right side were also developed, though not 

 quite to their full proportions. The fifth leg on the right side and 

 the third, fourth and fifth of the left side, were now reproduced, but 

 in a very small and rudimentary manner; all the joints were present, 

 but every part was reduced in size. The antennae were reproduced 

 about two-thirds their full size. During the month of February the 

 tips of the antennae were accidentally broken, so as to reduce their 

 length about one-third. 



April 20. The old shell is cast whole, as before, and with her 

 new dress the crawfish has also all her legs and claws nearly perfect. 



