3888 ° REPORT OF THE COMMISSIONER OF FISHERIES. 
Measurements. 
No. | Head. | Depth. | Dorsal.| Anal. | Scales. | Length. Notes. 
il 33 6 8 8 97 35 | Papille distinet. 
2 32 9 8 43 | Papille indistinct. 
3 ‘ 25 Do. 
| 4 25 Do. 
5 49 | Papille distinet. 
ns) 51 Do. 
7 40 Do. 
Some of the specimens were more or less imperfect, and Nos. 3 
and 4 were so small that accurate measurements could not be taken. 
The scales were not counted, except on the first specimen. The spec- 
imens examined were taken by Mr. KE. B. Forbes from a cave spring 
in southern I}linois. 
Chologaster papilliferus Forbes, American Nat., Jan., 1882, Cave spring in southern 
Hlinois. Jordan & Gilbert, Synopsis Fishes N. A., 325, 840, 1883. Jordan & 
Evermann, Fishes North and Mid. Amer., I, 704, 1896. Eigenmann, Proc. Ind. Ac. 
Sci., 1897 (1898) 231; Degeneration in the Eyes of the Amblyopside, its Plans, 
Processes, and Causes, Proc. Ind. Acad. Sci., 1898, 239 (summary); Eyes of the 
~ Blind Vertebrates of N. A., Archiv. f. Entwickelungsmech., 1899, 545; Marine 
Biological Lectures, 1899 (1900), 113. 
Chologaster agassizii Putnam. Pl. V, fig. 2. 
Body rather heavy but elongated, its depth 6 to 6.5 in length; head 
8.50 to 4.33; mouth very oblique, lower jaw projecting, maxillary 
reaching to the eye; eye very smal! and covered with skin, probably 
only partially functional, located more on upper side of head than the 
eyes of C. cornutus and C. papilliferus; gill-membranes joined to 
isthmus, not covering vent; pectoral fin 1.40 in head; caudal rounded, 
its length from base to tip less than head; dorsal with 8 or 9 rays, 
somewhat rounded, inserted nearer base of caudal than tip of snout, 
its front farther forward than front of anal; anal 8, smaller than 
dorsal; scales similar to those of C. papilliferus; no tactile papille 
present. 
Since this species lives entirely in caves, it is much lighter in color 
than either of the other 2 species of the genus. The myotomes are 
very distinct, and form the 3 usual angles along the sides of the body. 
The aponurotic septa, or lines between the myotomes, are dark, and 
merge together to form a distinct dark line at the apex of the upper 
angle. The apex of the middle angle is also visible for the same 
reason, although this line is not so dark. The line along the apex of 
the lower angle is much darker than that of the middle, but not so dark 
as the upper. By the merging of these lines 3 dark longitudinal lines 
along the side of the body are formed, the upper darkest, the middle 
one faintest but widest, and the lower one intermediate. Along the 
back, beginning at the base of the caudal and coming to the point 
just back of the head, is a yellowish line. The edges of the scales are 
