JORDAN ON FISHES OF DAKOTA AND MONTANA. 



789 



**. Dorsal fin with a strong spine, wbicli is comj)osecl of two, the posterior received 



into a longitudinal groove of the anterior ; inner 

 border of the ventral fins adherent to the body 

 dorsal behind ventrals ; teeth hooked, without 

 grinding surface. (Plagopterincc.) 



O. Body with small scales ; teeth 2, 4-4, 2 ; no barbel ' Lepidomeda. 



00. Body naked. 



P. Teeth 1, 4-4, 1 ; no barbel Meda. 



PP. Teeth 2, 5-4, 2 ; a barbel at the end of the maxillary Plagopterus. 



The relations of the European and American genera of Cyprinidw may 

 be approximately indicated by the following grouping. The clusters of 

 genera here indicated as "groups" have about the value attached by 

 the "ultra conservative" writers to their "genera". The subfamilies 

 here recognized, of CJiondrostomatince, Leuciscince, and Ahramidince, are 

 very closely connected by their American representatives, perhaps too 

 closely for recognition. The group Graodontince is admitted provision- 

 ally, the singular character ascribed to the genus Graodus being pos- 

 sibly erroneous. I have not examined the intestines of Ehodeus and 

 Leucos, and their positions in the series may require change. The type 

 of the European genus iSqualius has a narrow grinding surface on 

 its teeth, and it is congeneric with the species referred by Girard to 

 Cheonda. In like manner, our current genera Bicliardsonkis, Tigoma, 

 and Myloleucus are equivalent to Alburnus, Telestes, and Leucos. 



European genera are designated by an asterisk (*); genera common 

 to Europe and America by a dagger (t). 



Subfamily CAMPOSTOMATIN^. 



Campostoma Agassiz. 

 Subfamily CHONDKOSTOMATIN^. 



Group AcROCHiLi. 



Acrochilus Agassiz. 

 Group Chondrostomata. 



Chondrorlxynclms* Heck el. 



Chondrostoma* Agassiz. 

 Group Orthodontes. 



Orthodon Girard. 

 Group Lavlni^. 



Lavinia Girard. 

 Group Ehodei. 



Mhodeus* Agassiz. 

 ^ Group Chrosomi. - 



Chrosomus Rafinesque. 

 Group Hybognathi. 



Zophendum Jordan. 



Hyhognathus Agassiz. 



Coliscus Cope. 



Pimephales Rafinesque. 



HyhorhyncJms Agassiz. 



Subfamily EXOGLOSSIN^. 



Exoglossum Rafinesque. 



Subfamily GRAODONTIN^. 

 Graodus Giinther. 



Subfamily LEUCISCIN^. 

 Group TiAROG^. 

 Tiaroga Girard. 



Group COCHLOGNATHI. 



Cochlognathus Baird & Girard. 

 Group LuxiLi. 



Algansea Girard. 



Mudsonius Girard. 



Chriope Jordan. 



Cliola Girard (Codoma, Cyprinella, 

 etc.). 



Protoporus Cope. 



Noiropis Rafinesque. 



Lythrurus Jordan. 



Luxilus Rafinesque. 

 Group Ericymb^. 



Ericymba Cope. 

 Group Phsnacobii. 



PhenacoMus Cope. 

 Group Rhinichthyes. 



Bhinichthyes Agassiz. 

 Group Ceratichthyes. 



Agosia Girard. 



Ceraiiehthys Baird. 



Apocope Cope. 



Couosius Jordan. 



Platygohio Gill. 



