20 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY III. 



Genus PHOTOGENIS Cope. 



IG. PlIOTOGENIS NIVKUS [Copc) J. & B. 

 Eybopsia /liccnx Cope (1^70), Proc. Am. Pliilos. Sue. 4()1. 



A very pale species, related to Phoiogcnis analostanus and P. gahiclnrufi^ 

 ratber than to tlie species of '■'•IIybopsi.s^\ to wbieli genus Piolessor Coj e 

 referred it. ]\Iy specimens are all very vrhite, with a narrow bhiisli 

 stripe along the caudal peduncle, which sometimes forms a faint spot 

 at base of (laudal. In male specimens, the snout and ante-dorsal region 

 are covered with small tubercles. In males, the dorsal fin ia considerably 

 elevated. In color, the dorsal fin is largely dusky on the last rays, the 

 most of the tin somewhat creamy-tinted. The tip of the dorsal fin and 

 the tips of the caudal are filled with milk-white pigment, as in the 

 related species. The anal fin is entirely milky. The teeth are 1, 4-4, 1, 

 l)rovided with a narrow masticatory surface. 



Photof/enis niceus is abundant in the Saluda lliver. It was first dis- 

 covered by Professor Cope in the Ciitawba iiiver. 



17. PnoTOGENis ANALOSTANl'S {Girard) Jordan. 



We did not find this species in tke Saluda, although Professor Cope 

 states that it is abundant in the Catawba. It is perhai)s possible that 

 Professor Cope mistook our Codoma chloristin, a species which resem- 

 bles it very much, except in dentition, for the true (uialo.stanu,s. The 

 '■'Cyprinella tinalo.slana''^ has been a stumbling-block in the classification 

 of these fishes, as to the masticatory surface of Luxilus it adds the cre- 

 nations of Cyprinella. We are inclined to think that CyprincUa should 

 be restricted to those species whose teeth are without grinding surfaces 

 and are permanently crenate. The relations of Luxihis aiuilo.^ta)iu.<i, 

 npiloptents,(jalacturus,lcvcopus, and wrn'?/,s are much more intimately with 

 the species of Codoma than with Lnxilus^ but the development of grind- 

 ing surfaces on the teeth renders it necessary to refer them to the latter 

 genus, unless Phoiogenin be admitted as a distinct genus. 



Genus CODOMA Girard. 

 (Subgenus lUiOGALA Jordan.) 



Photogcnia J«)IJI)ax (1^77), Ann. Lye. Nut. Hist. N. Y. :>:>,'). (Not of Copc, whose type, 

 /'. Huilopterns provi*- tn in' ;i vi;iiii'si i1<m'1v ii-l:itc(l fo /.. nnaldstaniiK. if mit 

 i(i<Mitiotil with it.) 

 Examination of a large number of spteimens supposed to be Photogenis 



spilopterus, from Saint Jo.seph's Piver, iji Northern Indiana, Professor 



