hO 



UNITED STATES AND MEXICAN BOUNDARY, 



The scales are also larger, deeper than long, anteriorly sub-truncated and posteriorly 

 rounded, with radiating furrows upon the latter section only. 



Dl,8; Al, 7; C 3, 1, 6, 5, 1, 4 ; V6; PH. 



The color is yellowish brown, somewhat lighter beneath than above, with a silvery streak 



along the middle of the flanks. 



IT 



fig. 18 is the head seen from beneath, exhibiting the outline of the mouth ; fig. 19, a dorsal 

 scale ; fig. 20, a scale from the lateral line ; and, fig. 21, a scale from the abdominal region. 



1 si of specimens. 



Catal. No. 



79 



No. of spec. 



1 



Locality. 



Rio San Juan, near Cadereita, New Leon. . 



When collected. 



Whence obtained. 



1853 



Lt. D. N. Couch.... 



Nature of specimen 



Alcoholic 



MED A, Girard 



V 



Gen. Char. — Body elongated, slender, compressed, fusiform in its profile, and scaleless. The lateral line may be traced 

 along the middle of the flanks, slightly deflexed upon the abdomen. The head is elongated, sub-conical, rounded upon the 

 snout, without being truncated. The mouth is proportionally large, sub-terminal, its gape s-lightly oblique upwards, the lower 

 jaw fitting into the upper. No barbels. The eye large and circular. The isthmus narrow. Dorsal fin higher than long, 

 provided anteriorly with a stout, articulated, but simple and osseous ray, grooved posteriorly, and nearly as high as the second 

 ray, which is slightly higher, and the highest of all. The ventrals are inserted in advance of the anterior margin of the dorsal, 

 and adherent to the ventral line for more than the half of their total length. The caudal is deeply furcated. The pharyngeal 

 bones are slender, especially upon their inferior limbs, which are longer than the upper ones. The latter are flattened or 

 expanded, and curved inwardly downwards. The teeth are very slender, sub-conical, compressed at their base, of the prehensile 

 kind, of the hooked type, without grinding surface. They are disposed upon a double series of one and four: 1 | 4 — 4 | 1. 

 Thus equally distinct from both Phoxinus and Phoxinellvs, to which this genus bears an external resemblance. 



Six.—Meda, Grd. in Proc. Acad. Nat. Sc. Philad. VIII, 1856, 191. 



The genus here referred to differs widely from all other American cyprinoids by the presence, 

 upon the anterior margin of the dorsal, of a stout undivided (but articulated) ray, resembling 

 in its general appearance that which is observed in Borbus, LuciobarbuSj Scaphiodon, and 

 Systomm, differing, however, from all of these in the structure of its posterior edge, which is 

 grooved instead of being serrated. The absence of buccal barbels in Meda is another feature to 

 warrant its claims as a genus, differing from Cyprinus, Carassius, Carpio, &c, by characters 

 equally obvious. 



MEDA FULGIDA, Grd. 





Plate XXVIII, Figs. 9 & 10. 



Spec. Char.— Head constituting a little more than the fifth of the total length. The angle of the mouth corresponds to a 

 vertical line drawn in advance of the orbit. The broad insertion of the ventrals is equally characteristic. 



S*x.—Jiledafulgida f Grd. in Proc. Acad. Nat. Sc. Philad. VIII, 1856, 19a. 



The dorsal region is reddish yellow, the middle of the flanks appearing as though painted 

 with silver, whilst the inferior region is of a pale yellow. 



D9- A 1,11; 5,1,9,8,1,4; V 1 ; P 15. 





