251 
ance rendered me by Mr. William McDoel, General Manager of the Monon, 
in enabling me to make explorations in the numerous caves of the Lost 
River region along his line and to visit caves at greater distances. Mr. 
H, C. Ganter, the manager of the Mammoth Cave Hotel, not only granted 
me leave to collect in the cave, but did everything possible to make my 
trip to this cave successful. 
CHOLOGASTER AGASSIZII AND Irs Eyres. By Carn H. ErGEnMANN. 
[Abstract.] 
Chologaster agassizii has heretofore been known from the type speci- 
men only. This came from a well at Lebanon, Tennessee. I have heard 
of other specimens, but neither persuasion nor a liberal cash promise was 
able to bring one of these specimens. Five specimens were recently 
caught by me. 
Chologaster agassizii possesses this peculiar interest: The Amblyops- 
ide, evidently the wreck of an ancient numerous family, are now repre- 
sented by Chologaster with well-developed eyes, and the various blind 
fishes with greatly degenerate eyes. Of Chologaster there are three known 
species. One of these lives in the streams of the Atlantic slope and does 
not concern us. The other, Ch. papilliferus, lives in springs in south- 
western Illinois, while the third, Ch. agassizii, lives altogether in sub- 
terranean streams. I wanted Ch. agassizii to compare its eyes with those 
of Ch. papilliferus. The interest is heightened by the fact that the two 
species are very similar, the eye of agassizii is, however, very much 
smaller and will, when examined, give us one of the steps of degeneration 
through which this structure passes. 
Tue EYE or TYPHLOMOLGE FROM THE ARTESIAN WELLS OF SAN M4RCOs, 
Texas. By C. H. EIGENMANN. 
{ Abstract.] 
The eye of Typhlomolge has lost the lens and for the most part the 
vitreous body. The eye has, as a result,collapsed. The pupil is still open 
in the young but becomes closed in the adult, and in its region the pig- 
ment of the iris becomes much thicker than the pigmented layer at the 
back of the retina, 
