THE MAMMOTH CAVE 101 
possible, therefore, that in Amblyopsis the lens 
may have been developed where we find it, and 
that it was never connected with the integu- 
ment. Whatever views be taken with regard 
to its development, the anatomical characters 
which have been enumerated show that, though 
quite imperfect as we see it in the adult, it is 
constructed after the type of the-eyes in other 
vertebrates. It certainly is not adapted to the 
formation of images, since the common integu- 
ment and the areolar tissue which are interposed 
between it and the surface would prevent the 
transmission of light to it except in a diffused 
condition. No pupil, nor anything analogous 
to an iris, was detected, unless we regard as 
representing the latter the increased number 
of pigment-cells at the anterior part of the 
globe.” 
In continuation of the same observations, 
the professor next treats of the Hur; and his 
remarks on this point are conclusive in contra- 
diction of the sensational newspaper article 
previously mentioned. He says: 
“Tt is said that. the blind fishes are acutely 
sensitive to sounds, as well as to undulations 
produced by other causes in the water. In the 
only instance in which I have dissected the 
g* 
