Slorer's Synopsis of the Fishes of North America. 267 



1. Ammocostes bicolor, Lesueur. 



Back and sides reddish ; abdomen white ; the color separated by an undulating line. 

 Xape of the neck elevated. Dorsal fins low, separated. On the inside of the upper lip are 

 small granules, and at the opening of the throat, small ramified papillae. 



Length, (?). 



Connecticut River, Lesueur, 



Ammoccetes bicolor, Lesueur, Trans. Amer. Phil. Soc. (New Series), I. p. 3 ; G. 

 " " Mini Lamprey, Storer's Report, p. Vj: . 



" Colored Mud-Lamprey, Dekay's Report, p. 383, pi. 79, fig. 248. 



2. Ammoccetes concolor, Kirtland. 



Body subcylindric, more compressed laterally behind the vent ; transversely marked with 

 numerous curved sulcations. Back and sides uniformly of a light olive, or sometimes a 

 leaden hue ; the belly and throat of a yellowish white ; the fins pale and diaphanous. Ir- 

 regular series of dark brown dots are imprinted on the whole length of the sides of the body. 

 and more faintly above the branchial openings. Body convex above the branchial openings. 

 Dorsal single, commencing over the middle of the body. Mouth semicircular, elongate ; 

 lower lip transverse ; nose terminates in a short snout, projecting over the mouth. 



Length, 4 to 5 inches. 



Mahoning and Scioto Rivers, Kirtland. 



Ammoccetes concolor, Mud-Eel, Blind Eel, Kirtland, Bost. Joum. Nat. Hist., iv, p. 173, pi. 27, £>. 1. 



3. Ammoccetes unicolor, Dekay. 



Color nearly uniform throughout. Dorsal single. Opening to the throat very large, but 

 accurately closed by six irregular and ragged subcartilaginous processes, which meet in the 

 centre. 



Length, 3 to 5 inches. 



Vermont, Thompson. New York, Dekay. 



AmmoccEtes unicolor, Plain Mud- Lamprey, Dekay's Report, p. 3S3, pi. 79, fig. 250. 



