Cope.] 676 {May 17, 
18. CALLOPHYSUS LATERALIS Gill. 
Coll. 1877. 
14. AGENIOSUS BREVIFILIS Cuv. Val. 
Coll. 1878. 
15. EUANEMUS NUCHALIS Spix. 
Coll. 1873-1877. 
16. EUANEMUS BRACHYURUS, sp. nov. 
A single specimen of this species compared with three of the #. nuchalis, 
exhibits the following differential characters: With the head and abdomen 
of about the same length, the caudal region is only two-thirds as long ; 
hence the anal fin is shorter, and is supported by fewer rays. The dorsal 
spine is materially longer and stronger. The head is much wider than in 
a #. nuchalis of the same total length. The teeth are much more numer- 
ous, forming wide bands on the dentaries, and a well-detined premaxillary 
band. The humeral process is naked; in H. nuchal’s it is covered by a 
soft skin. 
The depth at the first anal ray is one-sixth the length less the caudal fin. 
The length of the head enters the same 4.8 times. The length of the eye 
enters the head three times, and the interorbital width, one and two-third 
times. The dorsal spine is weakly serrate behind, smooth in front. The 
pectoral spine is strongly serrate behind, and is smooth in front ; it is about 
as long as the head, and one quarter longer than the dorsal spine. Radii 
D.1.7; C.+17+,; A. 87; V. 14, the first ray enlarged; P. I. 12. The 
inner rays of the ventral fins adhere to the integument of the abdomen, but 
not to those of the opposite fin. The ventrals are wider than the pectorals 
and nearly reach the anal fin ; the pectoral spines do not reach the base of 
the ventrals. The humeral process is smooth, and reaches the end of the 
basal fourth of the spine. The maxillary barbels reach nearly to the ex- 
tremity of the pectoral spine, while the anterior mentals reach to the base 
of the same. 
Total length. M. .145 ; of head .025 ; do. to base of anal fin .070 ; of base 
of anal fin .040. J.ead-colored, sides of abdomen silvery ; base of caudal 
fin blackish, the color extending into the superior and longer lobe. 
17. AUCHENIPTERUS BREVIBARBIS, Sp. NOV. 
Form robust ; length of head entering total, without caudal fin, a little 
over four times ; the depth of the body at the ventral fins entering the same 
five times. Head above coarsely granular, frontal fontanelle reduced to a 
small round hole. Mandible projecting a little. Anterior mental barbel 
as long as three diameters of the eye; the posterior not reaching the line 
of the posterior border of the operculum. Maxillary barbel reaching to the 
middle of the pectoral spine. Diameter of eye less than one sixth the in- 
terorbital width. Humeral process half as long as pectoral spine. Lateral 
postemporal process decurved so as to be nearly iv vontact with the middle 
of the humeral process. 
Radial formula: D. 1.5; P. I. 6; V.7; A. 22-3. Dorsal spine very ro- 
