FISHES SILURIDAE PIMELODUS ANTONIENSIS. 



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The upper regions are greenish brown, whilst the inferior regions are whitish. The fins are 

 olivaceous, at least the rays, for, the interradial membrane has a proclivity towards a black tint, 

 which is particularly conspicuous on the anal, and but slightly on the ventrals and pectorals. 



References to the figures. Plate XLL, fig. 4, represents Pimelodus catulus, size of life. Fi^. 5 

 is an outline of the same, seen from above. Fig. 6 represents the head from beneath. 



List of specimens. 



2. PIMELODUS FELINUS, G r d . 



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 thiice 

 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 off 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 ; 7, 1, 8, T, 1, 8 ; V 8 ; PI, 8. 



The upper regions are of a uniform chocolate brown tint, whilst the inferior regions are dull 

 white. 



List of specimens. 



3. PIMELODUS ANTONIEXSIS, 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. Bise of anal fin 

 somewhat longer than the head. Caudal fin posteriorly rounded, forming a little less than the sixth of the total length. 

 Pectoral spine serrated upon its inner edge. Reddish brown above ; whitish beneath. 



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