34 



UNITED STATES AND MEXICAN BOUNDARY. 



Family CYPMMDAE. 



ICTIOBUS TUMID US, Grd. 

 Plate XIX, Figs. 1—4. 



Spec. Char. — Head constituting about the fifth of the total length. Snout sub-conical. Mouth very small and prominent ; 

 lips small. Eyes very large, subcircular, their diameter being contained about four times in the length of the side of the head. 

 Anterior margin of dorsal fin nearly equi-distant between the extremity of the snout and the insertion of the caudal. Tips of 

 posterior rays of anal extending as far as the base of the caudal. Extremities of ventral fins reaching the vent ; extremities of 

 pectorals extending almost to the base of the ventrals. Caudal fin furcated and equal to the head in length. 



S 



Y V. 



Carpiodes tumidus, B & G. in Proc. Acad. Nat. Sc. Philad. VII, 1854, 28. 

 Ictiobus lumidus, Grd. in Proc. Acad. Nat. Sc. Philad. VIII, 1856, 170. 



The scales are nearly as deep as long, exhibiting radiating furrows upon their anterior and 

 posterior sections. Thirteen longitudinal series may be counted upon the line of greatest depth, 

 and from thirty- seven to thirty-eight scales in the lateral line. 



D 2, 27 ; A 2, 9 ; C 5, 1, 8, 8, 1, 4 ; V 2, 9 ; P 16. 



The color is light reddish brown above, and yellowish white beneath. 



Plate XIX, fig. 1 represents Ictiobus tumidus, size of life ; fig. 2 is a scale from the dorsal 

 region ; fig. 3, a scale from the lateral line; and, fig. 4, a scale from the abdominal 



region. 



List of specimens. 



Catal. 

 No. 



No. of 

 spec 



180 



6 



Locality 



When collected 



Near Fort Brown, Texas 



1853 



Whence obtained. 



Major Emory 



Nature of 

 specimens. 



Collected by 



Alcoholic . . 



John H. Clark 



1. MOXOSTOMA. KENNERLII, Grd. 



Plate XX, Figs. 7—9. 



Spec. Char.— In its general physiognomy this species resembles ffl. oblongum, more than any other of its genus. The 

 greatest depth, taken immediately in advance of the dorsal fin, does not enter quite four times and a half in the total length. 

 The head forms a little less than the fifth of that same length. The lower lip is rather broad and very little omarginated, 



it is very thin and quite sub-divided. The anterior margin of the dorsal is much nearer the tip of the 



ormis 



snout than the insertion of the caudal ; the upper margin of that fin is sub-convex and as long as high, whilst in M. claviformis 

 the height is much greater than the length. The caudal is deeply concave posteriorly ; the anal is deep and narrow, its 

 extremity extending, as usual in the genus, to the base of the caudal. The ventrals have pretty much the same position as in 

 M. claviformis. 



Stn. — Moxostoma kennerlii, Grd. in Proc. Acad. Nat. Sc. Philad. VIII, 1856, 171. 



The anterior two rays, in both the dorsal and anal fins, are mere rudiments ; also the anterior 

 one in the ventral fins. The scales are not quite so long as in M. claviformis. 



D 2, 12 ; A 2, 8 ; C4, 1, 8, 8, 1, 3 ; V 1, 9 ; P 13. 



Plate XX, fig. 7 represents Moxostoma kennerlii, size of life ; fig. 8 is a scale from the dorsal 

 region ; and, fig. 9, a scale from the abdominal region. 



