66 CARL H. EIGENMANX. 



ties differ strikingly while alive. In the Horse Cave specimens the head is 

 pointed, the cheeks puffed, the eye spaces show conspicuously as white 

 spots and bulge out like a rounded dome, the fatty masses above and 

 below on caudal peduncle are conspicuous and white. They measure 

 20-50 mm. 



The specimens from Glasgow have the eye-spaces inconspicuous, not 

 protruding, and the caudal fatty masses are inconspicuous. The largest 

 specimen from Horse Cave agrees with these in most respects. 



These specimens were put into two aquaria with siphon overflow of 5 

 and 10 mm., into a common central aquarium. The specimens readily 

 moved through the siphons from one to the other. One specimen had 

 traversed both siphons in between two and three hours. 



The Horse Cave specimens stay under leaves, etc., in their aquarium. 

 Those from Glasgow swim about more. 



The characters of the three known species of Typhlichtliys may 

 be summarized as follows : 



(a) Width of head more than 6 in the length to base of caudal ; length of head 



first anal ray nearer base of middle caudal ray than to the a.nus...wyandotte. 



(aa) Width of head 5 in the length to base of caudal ; length of head 3-3* ; orbital 

 fat-mass elongate, inconspicuous in life, not projecting ; cheeks little swollen ; 

 eye on an average .16 mm. in diameter, the smallest measures .14 mm. 



subterranens. 



(aaa) Width of head \y z in the length to base of caudal ; length of head 31/6 ; orbital 

 fat-mass round and very conspicuous in life, projecting dome-shaped beyond 

 contour of surrounding parts; cheeks much swollen ; eye less than .10 mm. 

 in diameter . ............................................................. osbonii. 



