V2 GENUS CATOSTOMUS. 



Head declivous; snout short, rounded, projecting be- 

 yond the jaw; anal Jin lunated; caudal Jin forked, with 

 pointed lobes; pectoral and analjins small; all the fins of 

 a gray-blue colour; eyes somewhat oblong; the scales are 

 very large, semirhomboidal, and variegated with blue, 

 yellow and green reflections; the lateral line has its origin 

 near the upper part of the operculum, and passes down the 

 centre of the body lips a little less developed than in the 

 remainder here described. 



P. 18.— D. 31.— V. 9.— A.40.— C. 18| rays. 



This is the stoutest species of the genus yet known: 

 it arrives to the length of twenty inches. Its vulgar ap- 

 pellation is Carp^ a name which I have preserved, in con- 

 sequence of its resemblance to the Common Carp of Eu- 

 rope. Inhabits the fresh water tributary streams of the 

 Chesapeake Bay, particularly Elk river, which supplies 

 the mai'kets of Philadelphia. 



2. C. gibbosus* Back elevated in front of the dorsal 

 Jin, which is almost as high as broad, and rounded? anal 

 Jin bilobated. 



Head nearly as high as long; snout short, roundish; 

 fa?7 strait; caudal Jin semilunated, lobes roundish, the in- 

 ferior one longer than the upper; scales very much crowded, 

 transversely, a short distance from the opercula, but more 

 developed on the rest of the body; the colour of the back 

 is a deep blue, with golden reflections; pectoral^ ventral 

 and anal Jins of a fine reddish orange colour; caudal Jin 

 tinted with carmine and violet: dorsal Jin bluish green; 

 abdominal scales red at their base; lateral line hardly per- 

 ceptible; body marked with four or five taint, transverse 

 bands. Length of specimen eleven inches. 



