256 PROCEEDINGS OF THE ACADEMY OF 



diameter of orbit. Pectoral not reacliing anal; soft annl and 

 dorsal not quite reaching end of caudal ; latter rounded. 



Color rich brown, with a black spot under the middle of the 

 dorsal fin, which is connected with the orbit bj'^ a broad black 

 band. The body is further crossed by five darker shades. Fins 

 dusk3\ Below brown, under lip yellow. 



Total length .117 m. to line of D. i. .021; do. of anal .058. 



Several specimens from the Ambyiacu. This species is, with A. 

 dimerus^ Heckel, and A. fiamlahris^ Cope, the onl}^ one with two 

 series of cheek scales. It difiers from the first named in the much 

 fewer fin radii, etc. 



ACARA COMPEESSTIS, Cope. 



Scales 35, transverse series, seven rows on the cheek. Radii D. 

 xiii-19; A. iii-15. Longest dorsal spine as long as muzzle and 

 half the orbit. Form oval, depth half length less caudal, body 

 compressed. Profile oblique, nearly straight from in front of 

 dorsal fin. Head 2.5 times in length less caudal ; orbit 3.2 times 

 in head, larger than muzzle 1.2 times in interorbital space. Left 

 dorsal and anal prolonged. Outer series of teeth larger. Total 

 length .0*79 m.; to dorsal (axial) .024; to anal (do.) .0395; to 

 caudal fin .0595. 



Color, injured by the alcohol, at present uniform brown, with a 

 black line from the angle of the mouth to that of the preoperculum, 

 and two black shades, one at base and the other at end of caudal 

 fin. Soft dorsal and anal black behind. 



Two specimens from the Ambyiacu. 



HYGROGONUS OCELLATUS, Agass. 

 Spix, Pise. Brasil., tab. 68. 



CLUPEIDiE. 



PELLONA ALTAMAZONICA, Cope, sp. nov. 



I^o teeth on the vomer, a distinct series on the palatine bones ; 

 the whole of the hyoid axis and tongue covered with dentigerous 

 plates. Bi-maxillary and maxillary teeth, the former considerablj'' 

 longer. Scales 23-77. Fin rays D. 18, A. 38-39. Dorsal fin 

 behind the ventral, its origin nearer the basis of the caudal fin 

 than the end of the muzzle, its last ray above the first anal ray. 

 Length of ventral fin equal diameter of orbit. Superior caudal 



[January 16, 



