276 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 56. 



about three-fifths of horizontal pupil diameter beyond snout. Max- 

 illary not entirely concealed behind by preorbital, about three- 

 quarters to nostril. Teeth minute, in villiform bands in jaws; upper 

 band much broader. Nostrils an elongate slit long as horizontal 

 pupil-diameter. Interorbital level. Rakers, 8+25, lanceolate, about 

 three-quarters of filaments, latter about two-thirds of eye. Scales 

 caducous, narrowly exposed, each with about 3 marginal striae to 2 

 basal lobes. Dorsal origm midway between ventral origin and last 

 dorsal ray base; depressed fin slightly beyond caudal base. iVnal 

 inserted about opposite first branched dorsal ray base. Caudal well 

 forked, lower lobe (damaged) apparently long as head ( 0- Pectoral 

 reaches fourtli branched dorsal ray, 1| in body without caudal. 

 Ventral, If in head, reaches vent close before anal. 



Color in alcohol with back above pectoral and head above eye 

 browTiish; sides and below silvery- white. Iris whitish. Dorsal and 

 pectoral blackish, deepest over outer portions, and rays of former 

 pale or whitish basally. Caudal pale brown. Ventral and anal 

 whitish. Length 143 mm. Loando. 



An example, already listed from the Gabun, a little smaller and in 

 poor preservation, shows: head, 3J; depth, 4; D. i, 9; A. i, 10; scales 

 (pockets), 43 from shoulder to caudal base medially; snout, 2| in 

 head; eye, 3; maxillary, 4;^-; interorbital, 3|. Lower jaw extends be- 

 • yond snout tip about three-fifths of eye-diameter horizontally. 

 Rakers, 6 +23 (?). Eye about seven-eighths of snout. Closed max- 

 illary not entirely concealed. Ventral origin about midway be- 

 tween front eye edge and caudal base. Pectoral reaches first two- 

 fifths in dorsal base, If in body without caudal. Anal inserted little 

 before pectoral tip. 



No differences could be noted in comparison of the above v.ith an 

 example in the Academy, from Panama. 



HEMIKAMPHUS BRASILIENSIS (Linnaeus). 



Head, from snout tip, 4} to 4f; depth, 5§ to 6i; D. ii, 11, rarely 

 II, 12; A. II, 9 to 11, rarely 8; scales, 55 to 60 in lateral Ime to caudal 

 base, though last 2 to 7 without tubes, and 6 to 8 more scales over 

 caudal base; 38 to 44 predorsal scales to head; snout, 2| to 3 m head 

 from upper jaw tip; eye, 4 to 4f ; maxillary, 3* to 4; interorbital, 

 3§ to 4. 



Body v^-ell compressed; sides flattened. Caudal peduncle with 

 least depth about three-fourths its length. Head pointed, com- 

 pressed, flattened sides but slightly converging below. Snout conic; 

 width, IJ its length. E5^e large, little advanced, though hind pupil 

 edge slightly behind middle in head length. Maxillary, | to eye. 

 Teeth fine or in minute bands in jaws; none in mouth roof. Mandible 

 about long as rest of head. Nostril large, close before upper front 



