OTHER FISHES OF THE FAMILY WITH EYES. 45 



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 

 Mr. 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. 2 a) instead of two, as in Amblyopsis (fig. 

 la) and Typhlichthys (fig. 3 a), 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, 4 a) 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 intestine follows the same course and the four 

 pyloric appendages are present as in that species. 



In the genus Chologaster f we have all the family characters as 

 well expressed as in the blind species, though it differs from Am- 



* A Synopsis of this family with descriptions of the four species will appear in the 

 " Report of the Peabody Academy of Science for 1871." (Reprinted here. p. 55.) 

 t Literally " bile-stomach;" probably named from the yellow color of the fish. 



