732 PROCEEDINGS OF THE ACADEMY OF [NoV., 



dorsal inserted before middle of base of anal, and anterior rays highest. 

 Anal large, inserted much nearer base of caudal than tip of snout, and 

 first rays highest. Pectoral elongate, pointed, and reaching a little 

 l^eyond root of ventral. Ventral rather small, reaching about f of 

 space to anal fin. Caudal emarginate. Anus placed nearer tip of 

 ventral than origin of anal fin. 



Color in alcohol uniform pale brown, with traces of silvery, especially 

 on lower surface and side of head. A narrow silvery band, not wider 

 than pupil, extending along side to base of caudal. Fins pale brown. 

 Peritoneum silvery. 



Length 2-^-^ inches. 



Type No. 14,934, A. N. S. P. Gabun river, Gabun country, West 

 Africa. P. B. DuChaillu. 



Two examples inclusive of type. 



(Gabunensis, of the Gabun river.) 



PHOXARGYREA gen. nov. 



Type Dioxargijrea dayi sp. nov. 

 Peritoneum silvery, otherwise close to Menidia. 

 (<Po^«?, tapering; 'Apyupia^ Argyrea, an old name applied to Menidia, 

 from silver, or made of silver.) 



Phoxargyrea dayi sp. nov. Plate XLI (lower figure). 



Head 4|; depth 6^; D. IV-I, 10; A. I, 24; P. I, 13; V. I, 5; scales 

 48 to base of caudal; 28 before spinous dorsal counting from interor- 

 bital space ; about 9 obliquely between spinous dorsal and anal ; width 

 of head 2} in its length; depth of head If; snout 3; eye 3f ; maxillary 

 3|; interorbital space 3J; pectoral 1^; ventral 2; length of caudal 

 peduncle from last dorsal ray a little over length of head ; least depth 

 of caudal peduncle 3|. 



Body elongate, slender, compressed, and greatest depth about origin 

 of anal. Side compressed, and more or less flattened. Caudal pedun- 

 cle elongate, narrow, compressed, and its least depth midway in its 

 length. 



Head elongate, compressed, attenuate, rather narrow, flattened 

 above in front, then convex posteriorly and sides flattened. Top of 

 head smooth, without ridges. Snout elongate, conic, and somewhat 

 flattened above. Eye moderately large, a little anterior, and not 

 impinging on upper profile. Mouth rather small, oblique, and jaws 

 subequal in closed mouth. Premaxillary broad posteriorly, its edge 

 strongly curved. Corner of mouth about midway between tip of 

 snout and front rim of orbit. Mandible rather small, not forming a 



