CR USTA CEANS OF NICKAJA CK CA VE—HA Y. 489 



;iikI fading intogTaj'ishoii the sides. Beginning at the cervical groove 

 and extending the full length of the abdomen, but not including the 

 telson was a conspicuous light-brown stripe, widest on the carapace 

 and with irregular and poorly deiined margins, but on the abdomen 

 pretty well defined. In addition to the median stripe, the a])domen 

 had on each side a lateral stripe, well defined along its inner margin, 

 but of uncertain limits outside. There was a faint suspicion of rusty 

 3^ellow on the sutures in the external blade of the tail fin and the spines 

 of the body were white. Beneath, the color was very light vinaceous. 



In the summer of li>01 I found this crayfish in some num])ers under 

 the stones in a small pool formed by the stream issuing from Nickajack 

 Cave. The males were all of the second form and both sexes exhibited 

 the two-color phases mentioned above. Several of the specimens were 

 brought alive to Washington, hxxt most of them soon died. Two, a 

 male and female, survived several months, living in a small bowl in 

 which the water was frequently changed and food supplied from time 

 to time in the shape of bits of apple and shreds of meat. November 

 15 the female shed her shell, but did not exhibit a perceptible increase 

 in size. December 20 the male shed his shell and came out as form I, 

 but without a urarked increase in size. 



It may ])e added that among the specimens collected at the mouth of 

 Nickajack Cave, two of the second-form males had evidently shed their 

 shells very recently; so, from evidence now at hand, it looks as if the 

 second-form condition begins in August and lasts until December, but 

 1 am inclined to believe that the specimen kept in captivity had its 

 ecydysis somewhat hastened by the unnatural conditions. 



CAMBARUS SPINOSUS Bundy. 



Specimens of this species (Males f . II and females) were obtained 

 from a small stream flowing from a pond which, in turn, was fed b}" the 

 cave stream known as John Ross Spring near the town of Rossville, 

 Georgia. They agree very well with typical specimens, except as 

 regards the length of the posterior portion of the carapace, which is a 

 little more than one-half as long as the distance from the cervical 

 groove to the lateral spines of the carapace. 



In ha])its they seemed to be very similar to L. p'i'oinnqwus Hagen, 

 living in shallow burrows in the soft mud, in shallow water, or in exca- 

 vations under flat stones. 



