212 [September, 



1. Clinostomcs elongatus. Luxilus elongaius, Kirtl. Rep. 1838, pp. 169, 

 193. Bost. Journ. Nat Hist. III. 1840, 339. PL iv. 1. Leuciscus elongatus, 

 Dekay, Fauna, of N. Y. III. 1843, 214. Storer, Synops. 1846, 161. Val. va. 

 Cuv. k Val. Hist Nat. Poiss. XVII. 1844, 494. Leuciscus producius, Storer, 

 Synops. 1846, 164. 



Inhabits most of the tributaries of the Ohio River. 



2. Clinostomus fonduloides. The body is proportionally much shorter 

 than in C. elongatus, and less tapering posteriorly also. The head consti- 

 tutes a little more than the fifth of the entire length. The greatest depth is 

 equal to the length of the head. The eye is a little smaller than in any of its 

 hitherto known congener ; its diameter entering three times in the length of the 

 side of the head. The scales are a good deal larger than in C. elongatus. The 

 color is of a pale red, with a silvery hue along the middle of the flanks, and a 

 few scattered black spots. 



The specimens before us we caught in the creeks and inlets of the Potomac 

 River, in the neighborhood of Washington, D. C, the largest of which measuring 

 about three inches. 



3. Clinostomus afpixis. Resembles the preceding one in its general bear- 

 ing. The body however seems to be more tapering posteriorly, the head 

 larger and the mouth more deeply cleft, since the posterior extremity of the 

 maxillary reaches a vertical line passing through the anterior rim of the pupil, 

 whilst in C . funduloides the extremity of the same bone extends but half way 

 between the anterior rim of the orbit and the pupil. The eye is a little larger 

 also, whilst the scales are smaller. 



Inhabits the waters of James River, Va. Collected by S. F. Baird. 



4. Clinostomus carolinus. The head is larger than in C. affinis, and the 

 body more elongated, compared to the depth. The eye is a great deal larger, 

 and the scales smaller. Blackish brown above, with scattered black spots ; 

 reddish beneath ; flanks golden. 



From Salem, N. C. Collected by J. T. Lineback and School. Specimens 

 sent to the Smithsonian Institution. 



Alburnus lepidulus. The most slender and elongated of the species 

 hitherto known to us. The total length is about four inches, in which length, 

 the depth enters a little over eight times. The head itself constitutes about 

 the sixth of the length. The posterior extremity of the maxillary scarcely 

 reaches the vertical line drawn in advance of the orbit. The caudal fin is a 

 little longer than the head. The anterior margin of the dorsal fin is nearly 

 equidistant between the tip of the snout and the concavity of the caudal. The 

 pectorals and ventrals are rather small. A broad silvery band maybe observed 

 above the lateral line. 



Specimens from Black' Warrior River, Ala. Prof. A. Winchell. 



Plargyrus argentatus. A specimen of this species is about three 

 inches long, the head forming the fifth of the entire length. A vertical line 

 drawn across the anterior rim of the orbit, intersects the extremity of the 

 maxillary bone. The eye is large ; its diameter entering three times in the 

 side of the head. The dorsal scales anterior to the dorsal fin are quite small, 

 contrasting greatly with those of the side which are well developed. The 

 anterior margin of the dorsal is nearer to the insertion of the rays of the caudal 

 fin than the tip of the snout. The dorsal region is pale red, whilst the sides 

 appear as if coated with silver. 



Inhabits the waters of James River, Va. S. F. Baird. 



CERATICHTHYS, Baird. 



Body elongated, fusiform or subfusiform, somewhat compressed. Head 

 flattened above, very declivous anteriorly with the snout rounded and over- 

 lapping the lower jaw. Mouth moderate in size, subterminal and horizontal 



