PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 507 



This species appears to be quite abiiudaut in the Chickasawha at 



Enterprise. Tlie largest individuals obtained have a total length of 4 



inches. 



Genus ERICYMBA, Cope. 



36. Ericymba buccata. Cope. (No. 27,421.) 



Eriajmba buccata, Copk, Proc. Acad. Nat. Sci. Pbila. 1865, 87 ; Traus. Amer. 

 Phil. Soc. 18G9, 301. 



Several individuals of this species were seined in the Chickasawha 

 Eiver 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 OPSOPCEODUS, Hay, gen. nov. 



('Otj'onoibg + d^ovg.) 



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 i^haryugeals. Dorsal somewhat behind the auterior 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 

 auimal, 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. Opsopoeodus emiliae, Hay, sp. nov. (No. 27,429.) 



Form of the body as given above. Depth in the length 4^ times. 

 Head in the length 4^. 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 tij) 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. Eye 

 greater than the snout, 3 in the head. 



Dorsal and anal fin-rays as follows : D. I, 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 headj 

 its height a little less than the length of the head. 



