129 



Htjdranmra irifa^claia, 8torer, Jouni, Soc. Nat. Hist. 

 Boston, I,^ 1837, p. 417. 



— flaviila, Storer, Mem. Amer. Ac. V, pi. 25, figs. T) &■ G: 

 Baird, Nintli Smithson. Report, 1855, p. 344, 



Hydrargyra majalis, Cuv. & Val. XVIII, p. 207. 

 Fundidus majcdis, Guenther, VI, p. 322. 



This beautiful and lar^^'e species inhabits the Patuxent and 

 Potomac Rivers, and perliaps otlier parts of the tide-waters of 

 the western shore, south of the Patapsco, As yet, it has not 

 3)9en reported from the latter river. 



Acad. Coll. 



XLVI— PERCOPSIDH. 



PERCOPSIS, Agassiz. 



P. guttatus. 



This fish, shaped like a young- Salmon, is of small size 

 and slender form, though the back is very much elevated. 

 Sides compressed, gradually diminishing in thickness from 

 the front backwards. Ground color yellow, much darker 

 above the lateral line than below. On the back are blackisli- 

 brown spots, sometimes disposed in two or three longitudinal 

 Tows^ wishout great regularity. Along the middle of the 

 body is a silvery ridge. A small adipose fin is situated at 

 about equal distance between the end of dorsal and base of 

 the caudal. 



Pin-rays:— D. 2. liJ; P. 12; V. 8; A. 1. 7; C. 2G. 



P. rjuitatus, Agass. Lake Super, p. 280, pi. 1, fig. 1—2. 



— j^eUiicida, (Salmoperca), Thompson, Proc. Bost. Soc 

 Nat. Hist. Ill, 1851, pp. 104, 300. 



Inhabits the lower Potomac River, and is often mistaken 

 for a young Salmon. Prof. Baird has seen specimens from 

 the Susquehanna River. 



S. I 



XLVn-SYNODONTIDH. 



SYNODUS, (Gron.) Bl Sclin. 



F. foetens. 



Providence Whiting. 



Body elongated, though tolerably stout; nearly round, or 

 41 little depressed. Head broad, and triangular, if seen from 

 11 



