CRUSTACEANS OF THE CAVE. 



17 



moth Cave, a brownish centipede-like myriopod, over an inch in 



length, which moved off in a rapid zigzag motion. Unfortunately 



he did not capture it. 



Next to the blind fish, the blind crawfish attracts the attention 



of visitors to the cave. This is the Cambarus pellucidus (Fig. 

 F.; . Tii . 131, from Hagen's 



monograph of the 

 North American 

 Astacidae) first de- 

 scribed by Dr. Tell- 

 k a m p f . He re- 

 marks that "the 

 eyes are rudiment- 

 ary in the adults, 

 but are larger in 

 the young." We 

 might add that this 

 is an evidence that 

 the embryo devel- 

 ops like those of 

 the other species ; 

 and that the inher- 

 itance of the blind 

 condition is proba- 

 bly due to causes 

 first acting on the a- 

 dults and transmit- 

 ted to their young, 

 until the production 

 of offspring that be- 

 come blind becomes 

 a habit. This is 

 a partial proof at 

 least that the char- 

 acters separating 

 the genera and spe- 



Cambanis peUucidus. c [ es Q f an i ma ls are 



those inherited from adults, modified by their physical surround- 

 ings an 1 adaptations to changing conditions of life, inducing cer- 

 tain alterations in parts which have been transmitted with more or 



MAMMOTH CAVE. 2 



