476 POPULAR SCIENCE MONTHLY. 



and east of the Mississippi. A single specimen of another Ty- 

 phlichthys has been found north of the Ohio River in a well at 

 Corydon, Indiana. Trogliehthys rosge inhabits the caves west of 

 the Mississippi in Arkansas and Missouri. 



Chologaster. — Mr. E. 13. Forbes secured a school of Cholo- 

 gaster papillif erus for me, and he wrote : " The little fishes were 

 found under stones at the edges of the spring very close to the 

 blutf, and when disturbed they swam back under the cliff. . . . 

 None were found at any considerable distance from the face of the 

 cliff." I found the Chologaster Agassizii to act similarly in the 

 river Styx, in Mammoth Cave. As soon as my net touched the 

 water they darted in under the ledge of rock at the side of the 

 little pool in which I found them. 



Chologaster })ai)illiferus detects its food entirely by the sense 

 of touch. Two which were kept in an aquarium for over a year 



Fi(i. 3.— Blind sahiiiKiiKlcr Inmi iiii urtc-ian well ut Sau Marcos, Texas {Typhlomolye). 



were starved for a few days. They became very nervous, con- 

 tinually swimming along the sides of the aquarium. Asellus was 

 introduced. These, even if quite near, produced no effect if mov- 

 ing in front of the Chologaster. The moment one came in close 

 proximity to the fish from any direction, by a flashlike motion it 

 was seized. None of them were swallowed. The fish became very 

 alert after the introduction of the sowbugs, and when swimming 

 forward would strike at a part of a leaf if it came in contact with 

 the head of the fish. It seemed evident that the eye gave no in- 

 formation of the character of the object. As Asellus was not alto- 

 gether to their taste, Gammarus was introduced. One of these 

 swimming rapidly toward the chin of the Chologaster from behind 

 and below was instantly seized when it came in contact with the 

 fish. The eye could not have located the Gammarus at all. The 

 action is in very strong contrast to the action of a sunfish, which 

 detects its food by the sight. It is undoubtedly this peculiar 



