EYES OF CAMBARUS SETOSUS AND CAMBARUS PELLUCIDUS. 387 



The structure of the eyes in the bUnd crayfish, C. pelliicidus, 

 was first noted by Newport (1855). Concerning his^specimens 

 which were taken from Mammoth cave, Kentucky, he states: 



Figs. 2 and 3. Dorsal views of the anterior ends of C. setosus and C. propin- 

 quus{?) 36 mm. long. They show the relative size and conspicuousness of the eyes 

 of the two species. 



"The hardened tegument which clothes the entire organ is 

 thinnest and most transparent in that part of the eye which forms 



