22 THE BLIND FISHES OF MAMMOTH CAVE. 
name from the singular form of the snout, which has two horn-like 
projections above. 
This is the only information ever published regarding this inter- 
esting fish and the only specimens known are those on which Prof. 
Agassiz based the above remarks. 
By the kindness of Professor L. Agassiz, who has placed all 
the specimens of the family contained in the Museum of Com- 
parative Zoology in my hands for study, I am enabled to give a 
figure and description of this interesting species from the three 
specimens in the Museum, which were labelled as the originals of 
-Chologaster cornutus Ag., from Waccamaw, S. C., presented by 
r. P. C. J. Weston, 1853. The largest of these specimens was 
distended with eggs and I was enabled to compare the ovary with — 
that of Amblyopsis. _ From its being single and the eggs very 
large, I have no doubt that it is a viviparous fish like the other 
genera of the family. The position of the ovary behind the stom- 
ach, as shown in fig. 2c, plate 2, and the presence of four pyloric 
appendages (Pl. 2, fig. 2a) instead of two, as in Amblyopsis (fig. 
la) and Typhlichthys (fig. 3a), are good internal characters, sep- 
arating it from the other genera, independently of the presence 
of eyes and the absence of ventral fins and papillary ridges. 
The stability of the internal characters I have mentioned was 
most unexpectedly substantiated by the discovery of a second 
species (Pl. 2, figs. 4, 4a) of the genus among the specimens in — 
the Museum of Comparative Zoology. I have the pleasure of 
dedicating this species* to Professor Agassiz, not only in kindly 
remembrance of the eight years I was associated with him as stu- 
dent and assistant, but also because the fish so well illustrates the 
decided position he has taken relative to the immutability of spe- 
cies. 
The only specimen known of this second species was drawn 
_ from a well in Lebanon, Tenn., and presented to the Museum by 
` Mr. J. M. Safford, Jan., 1854. It is a more slender fish than C. 
cornutus, but the duteadina follows the same course and the four 
pyloric appendages are present as in that species. 
In the genus Chologaster + we have all the family characters as 
well expressed as in the blind species, though it differs from Am- 
TA Synopsis of this family with descriptions of snt ymi species will appear in the 
“ Report of the Peabody Academy of Science for 18 
ł Literally “ bile-stomach ;” probably named from sA yellow color of the fish. 
