PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM, 507 
This species appears to be quite abundant in the Chickasawha at 
Enterprise. The largest individuals obtained have a total length of 4 
inches. 
GENUS ERICYMBA, Cope. 
36. Ericymba buccata, Cope. (No. 27,421.) 
Lricymba buccata, Copr, Proc. Acad. Nat. Sci. Phila. 1865, 87; Trans. Amer. 
Phil. Soc. 1869, 361. 
Several individuals of this species were seined in the Chickasawha 
River at Enterprise. Its geographical distribution is stated by Pro- 
fessor Jordan, in his “Catalogue of the Fresh Water Fishes of North 
America” (Bull. U.S. Geol. Surv. vol. iv, No. 2), to be from Pennsyl- 
vania to Illinois. Judging from the numbers taken at Enterprise, the 
species is quite as common in the South as farther north. Some of the 
specimens taken were 3 inches long, exclusive of the caudal. 
GENUS OPSOPCGIODUS, Hay, gen. nov. 
(Oworoti¢ + ddove.) 
Body fusiform, moderately elongated, slightly compressed. Mouth 
very small, very oblique, peculiar. Teeth raptorial, with a well-devel- 
loped masticatory surface, both bounding edges of which are conspicu- 
ously serrated, standing in a single row of 5-5 on a prominent process 
of the pharyngeals. Dorsal somewhat behind the anterior line of the 
ventrals. Barbels none. Lateral line complete. Intestine short. Anal 
fin short. 
This genus is apparently related to Myloleucus, Cope, and it is pos- 
sible that ‘the species that I describe below will have to be put under 
that genus. For the present, however, I think that the peculiar form 
of the mouth and the teeth, as well as the general organization of the 
animal, will serve to separate it from Myloleucus. The name is given in 
allusion to the thoroughness with which the food is prepared by the 
numerous serrated pharyngeal teeth. 
37. Opsopceodus emiliz, Hay, sp. nov. (No. 27,429.) ' 
Form of the body as given above. Depth in the length 4 times. 
Head in the length 43. Muzzle blunt and rounded. Mouth very small, 
very oblique, the lower jaw in the closed mouth fitting within the 
upper. In this case the cleft is nearly vertical. The length of the man- 
dible equal to the distance from the tip of the snout to the anterior 
margin of the orbit; while in Notemigonus chrysoleucus, which has a 
small mouth, the mandible reaches to the middle of the pupil. Lye 
greater than the snout, 3 in the head. 
Dorsal and anal fin-rays as follows: D. 1,9; A. I, 8. Dorsal begin- 
ning over the posterior rays of the ventrals, nearer the snout than to 
the base of the caudal; length two-thirds the head; its height equal to 
the length of the head. The anal fin in its length one-half the head ; 
its height a little less than the length of the head. 
