clupeoide^e. 235 



Dimensions. 



Inches. 

 Length, exclusive of the caudal fin . . . . .14 



,, from tip of the snout to anus ..... 9 



Greatest depth of the body . . . . 4f 



Observation. — The hiodon clodalis, obtained by M. Le Sueur at Pittsburgh, on the Ohio, 

 differs from the preceding, according to his description and figure, in the snout being mani- 

 festly shorter than the lower jaw, in the smaller depth of the body and less-arched belly, in 

 the lateral line being slightly curved before the dorsal, and not deflected posteriorly, and in 

 the number of the rays of the fins, which are as follow: P. 13 ; V. 7 ; A. 30; D. 15. M. 

 Le Sueur thinks it possible that the hiodon clodalis may be the same species with the tergisus 

 described below, the notched fin being merely a sexual difference. My description of the 

 naccaysh was drawn up at Cumberland House before I had seen M. Le Sueur's account of 

 the genus, and I have had no opportunity since of examining specimens from the United 

 States, otherwise I might have been able to point out the distinctive characters more clearly. 



[90.] 2. Hiodon tergisus. (Le Sueur.) Notch-finned Hiodon. 



Hiodon tergisus. Le Sueur, Journ. Ac. Sc.Phi/., i., p. 366. An. 1817. 

 Fresh-water herring. United States, apud vulgos. 



This species was found by M. Le Sueur at Buffalo, on Lake Erie, and by Mr. 

 T. Say at Pittsburgh, on the Ohio. M. Le Sueur gives the following description 

 ofit:— 



" Spec. Char. Anal fin large and rounded on its anterior part, very narrow on its pos- 

 terior part, notched in the middle." — " Colour of the gill-covers golden, eyes brown and 

 golden, back bluish, sides silvery, and fins yellow with metallic reflections on the rays. 



" Form. — Body lengthened, elevated ; back almost straight and parallel to the abdomen ; tail 

 narrow. Lateral line slight, arched towards the back. Dorsal subquadrangular, elevated on 

 its anterior part, the three first rays simple, the last double, the intermediate ones divided. 

 Pectorals falciform, pointed, placed horizontally in a longitudinal depression. Ventrals large, 

 somewhat rounded at their points, and furnished with a squamiform appendage at their base. 

 Anal long, with pretty strong divided rays, the last one double, the three first simple. Caudal 

 forked, lobes pointed, equal. Rays.— £r. 9; P. 13 ; V. 7; A. 32; D. 15; C. 18f Length 

 thirteen inches." — Le Sueur, I. c. 



2h 2 



