1818.] THREE NEW GENERA OF FISHES. 421 



mouth projected, lower lip five-lobed, pyramidal, silver- 

 ed, variegated and reticulated with blackish, lateral line 

 straight but faint. All the lower fins elongated, the pec- 

 toral reaching the abdominal, the anal reaching the tail^ 

 dorsal fin with twelve rays, tail forked. 



Obs- I found it in the Ohio, at the falls, where it is 

 called Stone -toter, in reference to the hard tubercles of its 

 head. It is quite a small fish, from two to three inches 

 long. It is used for bait. The mouth projects in a short 

 and obtuse snout: the iris is large, and gilt. Pectoral 

 fins, lanceolate acute, as long as the head and with 

 twelve rays; abdominal fins lanceolate acute, situated 

 nearly half way between the head and the vent, but not 

 reaching it. Dorsal fin nearer to the head than to the 

 tail, anal fin with ten rays; caudal fin with twenty. All 

 the rays are soft of course, as in the whole family. Scales 

 very minute. This species, distinguished by so many 

 secondary characters, may be the type of a subgenus, 

 which may be called Hypentelium, in reference to tlie 

 five lobes of the lower jaw. The species with a three- 

 lobed jaw may form then another section under the former 

 name of Maxillingua, 



3. Exoghssum annulatum, PI. 17, fi^. 4. 



Head narrow, forehead smooth and convex, lower lip 

 trilobated, body oblong olivaceous, back blackish, a black 

 ring at the base of the tail; lateral line curved downwards 

 at the base. Fins olivaceous, pectoral fins elliptic obtuse, 

 not reaching the abdominal: dorsal fins in the middle of 

 the back with nine rays; caudal fin forked. 



Obs. I detected this species in June 1817, in the Fish- 

 kill, which falls into the Hudson river above the Highlands: 



