FISHES—SILURI DAE—-PIMELODUS ANTONIENSIS. 
209 
The upper regions are greenish brown, whilst the inferior regions are whitish. The fins are 
olivaceous, at least the rays, for, the interracial membrane has a proclivity towards a black tint, 
which is particularly conspicuous on the anal, and hut slightly on the ventrals and pectorals. 
References to the figures. —Plate XLI, fig. 4, represents Pimelodus catulus, size of life. Fig. 5 
is an outline of the same, seen from above. Fig. 6 represents the head from beneath. 
List of specimens. 
Catal. 
No. 
No. of 
spec. 
Sex. 
Locality. 
When 
collected. 
Whence obtained. 
Nature of 
specimens. 
Collected by— 
926 
927 
i 
5 
9 
Fort Smith, Arkansas - 
1853 
1853 
Lt. A. W. Whipple .. 
Alcoholic. 
Dr. Geo. G. Shumard. 
2. PIMELODUS FELINUS, Grd. 
Spec Char —Head very much depressed, entering four and and a half times in the total length. Mouth large; jaws equal. 
Eye moderate, sub-circular; its diameter being comprised about six times in the length of the side of the head, and about thi ice 
on the interocular space. Dorsal spine slender, posteriorly serrated. Base of anal fin entering four times and one-third in the 
total length. Caudal rounded oif posteriorly, forming the sixth of the total length. Pectoral spines serrated upon their inner 
and outer edges. 
This species is closely allied to the preceding one, from which it chiefly differs by a wider 
mouth, a broader head, a longer and less deep anal fin, and the rounded off caudal fin. The 
anterior aspect of the pectoral spine is less conspicuously serrated than in the species just 
alluded to. On the other hand, the maxillar teeth are more developed, and the patches which 
they constitute are larger also. 
The maxillar barbel extends beyond the insertion of the pectoral; the post-nasal barbel is 
long and slender, and those under the chin being also quite developed, since both pairs, when 
stretched, extend beyond the edge of the gill membrane. 
D I, 6; A 25 ; C 7, 1, 8, 7, 1, 8 ; Y 8 ; P I, 8. 
The upper regions are of a uniform chocolate brown tint, whilst the inferior regions are dull 
white. 
List of specimens. 
Catal • 
No. 
No. of 
spec. 
Locality. 
When 
collected. 
Whence obtained. 
Orig’l 
No. 
Nature of 
specimens. 
Collected by— 
924 
i 
Trib. of Gypsum creek, Canadian. 
1853 
Lt. A. W. Whipple. 
XV. 
Alcoholic. 
H. B. Mollhausen. 
925 
2 
Coal creek, Ark_ 
1853 
.do. 
VI. 
_do_ 
. d °. 
3. PIMELODUS ANTONIENSIS, Grd. 
Spec. Char. —Head quite depressed, nearly wedge-shaped, constituting about the fourth of the total length. Upper jaw 
longest ; mouth large. Eye small, sub-elliptical ; its diameter entering about eight times in the length of the side of the head, 
and somewhat over four times in the interocular space. Dorsal spine slender, slightly serrated posteriorly. B ise of anal fin 
somewhat longer than the head. Caudal fin posteriorly rounded, forming a little less than the sixtli of the total length. 
Pectoral spine serrated upon its inner edge. Reddish brown above ; whitish beneath. 
27 a 
