SYNOPSIS OF THE FAMILY HETEROPYGII. 
G1 
Chologaster corniitns Agassiz. 
Agassiz, Amer. Jour. Sci., xvi, p. 135, 1853. Gieard, Procd. Acad. Nat. Sci. 
Philad., p. 63, 1859. Gunther, Cat. Fish. Brit. Museum, vii, p. 2, 1868. Putnam, 
Amer. Nat., vi, p. 21 et seq., Avith flgs. Jan., 1872. 
Plate 2 (Amer. Nat.,Vol. vi, Jan., 1872). Fig. 2. Natural size. 2a, stomach 
and pyloric appendages, Pvice nat. size. 26, scale magnified (nat. size represented 
by small outline over the left of the fig). 2c, abdominal cavity showing stomach 
and single ovary behind the stomach, twice nat. size. 
Head more than half as wide as it is long. Length of head, from 
tip of under jaw to end of operculum contained twice in length of 
body from operculum, to caudal fin. Width between the eyes equal to 
distance from eye to tip of under jaw. 
Eyes of moderate size, situated just back and over the end of the 
maxillaries. 
Dorsal and anal jins of nearly equal size, slightly rounded. Anal 
with slightly longer rays and commences under fourth ray of dorsal. 
Pectoral Jins pointed, reaching to line of commencement of dorsal. 
Caudal Jin Tpointed, about equal in length to the head. Membrane 
above and below extending but slightly on the tail. 
Scales very small and deeply imbedded in the skin. Circular with 
small smooth space forward of the centre. From 15 to 20 con- 
centric rings, cut by a few short radiating furrows on anterior, and 
longer and more numerous ones on posterior margin. 
Intestine is a little longer than in an Amblyopsis of the same size. 
The two pyloric appendages on the left side are close together and 
broader than the two on the right side, which are wider apart, 
longer and more slender than the others. 
Color. Yellowish brown, much darker above, lighter on sides, and 
light yellow on under part and sides of head, belly and under part of 
tail. Three longitudinal very dark brown lines on each side : the 
upper commencing near the middle of top of head and following 
along the back to base of caudal flu ; the middle one commencing at 
the nostril and passing through the eye to upper portion of opercu- 
lum, thence about in the centre of side to about the centre of base of 
caudal fin ; the lower commences under the pectoral fin and follows 
the ventral curve of the body to the base of caudal fin. All three 
lines are darkest and broadest forward, and terminate as a series 
of nearly confluent dots on the tail. Central rays of the caudal dark 
brown, outer rays uncolored. Dorsal, anal and pectorals not colored. 
3Ieasurements. The three specimens arc respectively 1-5, 2, and 2-3 
inches in total length. 
Geographical distribution. South Carolina. 
Specimens examined : — 
Museum of Comparative Zoology. 
3 specimens. No. 776. Rice Ditches at Waccamaw, S. C. Presented by P. C. 
J. Weston, 1853. (Orig. of Agassiz.) 
