106 GENUS CATOSTO^rUS. LOctober. 



have at one view before him all the American* species, 

 hitherto ascertained, of this ncAV genus. Hence my paper 

 assumes the character o^ 2i Monograph of the genus Catos- 

 tomus of North America. 



13. C. Bostomensis, Caudal fin greatly forked, lobes 

 equal and pointed; mouth very small, lunated; the lateral 

 line proceeds, with a regular curve, from the nape to the 

 tail. 



This species has a great resemblance to the common 

 sucker of the Delaware, C. communis, in the form of its 

 body, but it is somewhat shorter; and its very forked tail, 

 with equal lobes, distinguishes it from that species; the 

 scales are round, equal, and smallish on the back, near the 

 nape; the back is of a reddish brown colour, (in some spe- 

 cimens darker than in others) as is likewise the head; the 

 sides and abdomen are whitish; pectoral, ventral, and anal 

 fins of a reddish yellow colour; eyes large, roundish, and 

 placed about midway between the posterior part of the gill- 

 covers, and the end of the snout; the anal fin is pointed, 

 and runs to the base of the caudal fin, 



P. 18.— D. 13.— V. 10.— A. 9.— C. 18 rays. 



This fish inhabits the waters of Massachusetts, in the 

 neighbourhood of Boston. I obtained my specimen in the 

 Boston market. 



On mature reflection, I have concluded that this is the 

 species described and figured by Peck, as before stated, 

 though this author is censurable for intermmgling Forster's 

 description with his own. But I cannot join Mr. Peck in 



* I say American, for it is doubiful whether two or three foreign 

 species may not be classed with this genus. 



