62 
SYNOPSIS OF THE FAMILY HETEROPYGII. 
Habits. Nothing is known concerning the habits of this species, 
the only specimens observed being the three mentioned. From the 
fact of its having a single ovary containing a small number (about 60) 
of large eggs it is probable that it is viviparous. 
Chologaster Agassizii Putnam. 
Putnam, Amer. Nat., vi, p, 22 et seq., with hgs. Jan., 1872. 
Plate 1 (Amer. Nat., Vol. vi, Jan., 1872). Fig. 4. Natural size; ia, stomach 
and pyloric appendages, twice nat. size; ib, scale magnified (nat. size shown hy 
minute dot over left of the figure). 
Head more than half as wide as it is long. Its length is contained 
three times in the length of the body from the operculum to the base 
of caudal fin. 
Hijes proportionately large and placed over ends of maxillaries. 
Dorsal and anal fins broken, but probably of about equal size. Anal 
fin commences about under fourth ray of dorsal. 
Pectoral fins pointed and reaching about half way to the dorsal. 
Caudal fin pointed, not quite as long as the head. 
Scales very minute, longer than wide, with 4 or 5 concentric 
lines round a granulated centre. A few radiating furrows cut the 
concentric lines on the posterior margin. 
Pyloric appendages and stomach about the same as in C. cornutus. 
Color. Uniform light brown, without markings except that the base 
of the caudal fin is rather darker than rest of fish. Fins uncolored. 
3Ieasurements. Total length, 1-4 inches. 
Geographical distribution. Subterranean streams in Tennessee. 
Specimen examined -. — 
Museum of Comparative Zoology. 
1 specimen. No. 777. From a well in Lebanon, Tenn. Presented by J. M. 
Saffor^^)-i^n., 1854. 
principally differs from C. cornutus by having a longer 
'4 body and smaller head, by having the eyes proportionately larger, and 
its coloration. Nothing is known of its habits except the fact 
(^i^ subterranean life. The scales of the single specimen known 
indica^?^^)ung fish, and it is probably not over half grown. 
The four species given in this synopsis are all of the family 
as yet known, but that others will be discovered and the range of the 
present known species extended is very probable. The ditches and 
small streams of the lowlands of our southern coast will undoubtedly 
be found to be the home of numerous individuals, and perhaps of new 
species and genera, while the subterranean streams of the central 
portion of our country most likely contain other species. 
