GENUS BUBALICHTHYS. 201 



doubt that Kafinesqne had the same fish in mind as his C. carpio, and I 

 have accordingly adopted the latter name. 



Specimens in United States National Museum. 



Genus BUBALICHTHYS Agassiz. 



BubalicJitJiys AGASSIZ, Am. Journ. Sci. Arts. 1855, 192. 

 Sderognathus GUNTHER, Cat. Fishes Brit. Mas. vii, p. 22, 1868. 

 Catostomus et Carpiodes sp. of authors. 



Type, Carpiodes urus Agassiz. 



Etymology, povpuAos, buffalo ; faffi's, fish. 



Head moderate or rather large, deep and thick, its superior outline 

 rapidly rising, its length about 4 in that of the body : eye moderate, 

 median or rather anterior in position ; suborbital bones comparatively 

 narrow ; fontanelle always present and widely open. 



Mouth moderate or small, more or less inferior, the mandible short, 

 little oblique, or typically quite horizontal, the mandible less than one-third 

 the length of the head, the premaxillaries in the closed mouth below 

 the level of the lower part of the orbit ; lips rather thin, thicker than in 

 Ichthyobus, the upper protractile, narrow, plicate, the plica3 sometimes 

 broken up into granules; lower lip comparatively full (for a Buffalo- 

 fish), fain rly plicate, the pilous broken up into grannies, the lower lip 

 having the general fj- shaped form seen in Carpiodes ; jaws without car- 

 tilaginous sheath ; inuciferous system well developed ; opercular appa- 

 ratus well developed, but less so than in Ichthyobus, the operculuin 

 strongly rugose; isthmus moderate; pharyngeal bones triangular, with 

 large teeth, which increase in size from above downwards ; teeth com- 

 pressed, their grinding edge blunt, slightly arched in the middle*, and 

 provided with a little cusp along the inner margin, which is hardly 

 detached from the crown, and does not rise above the surface : gill-rakers 

 of anterior arch slender and stiff above, growing shorter downwards. 



Body ovate or oblong, the dorsal outline more or less arched, the sides 

 of the body compressed, the ventral outline curved also, but to a less 

 degree : scales very large, about equal over the body, their posterior 



