254 CYPRINID^. 



Pharyngeal teoth 4 . 1 — 1 . 4. The attachment of the gill-mem- 

 branes to the isthmus takes place opposite to the angle of the prte- 

 operculum. Gill-rakers short, pointed, few in number. 



Osage River. 



This description is takeu from an example in the Liverpool 

 Museum, 3| inches long. 



67. Leuciscus spilopterus. 



Photogenis spilopterus, Cope, Trans. Am. Phil. Soc. xiii. p. 378, 



D. 9. A. 1/8. Y. 7-8. L. lat. 38. L. transv. 6/?. 



The height of the body is contained five times in the total length 

 (without caudal), the length of the head four times and one-third ; 

 snout as long as the diameter of the eye, which is two-sevenths of 

 the length of the head ; mouth oblique, the maxillary extending to 

 the vertical from the front margin of the orbit. The pectoral 

 fins terminate at a great distance from the ventrals. Origin of the 

 dorsal fin a little nearer to the root of the caudal than to the end of 

 the snout. There are two longitudinal series of scales between the 

 lateral line and ventral fin. A plumbeous band along the hinder 

 half of the lateral line ; a spot on the upper hinder portion of the 

 dorsal, and a narrow vertebral line, black. 



Pharyngeal teeth sharp-edged, 4 . 1 — 1 . 4. (C'tyjf.) 



St. Joseph's River, South-west Michigan. 



b. Origin of the dorsal Jin distincth/ hekind the ventrals, 



68. Leuciscus ruhellus. 



Albm-nus ruljellus, Agassiz, Lake Super, p. 364, pi. 3. figs. 1-3 ; Ccype, 

 Proc. Ac. Nat. Sc. 'Philad. 1864, p. 282. 



D. 1/9. A. 2/10. V. 8. L. lat. 38. L. transv. 6/?. 



Tlie heigJit of the body is one-si.rth of the total length (without 

 caudal), the length of the head two-ninths. Snout moderately 

 pointed, ivith the lower jaw sliglifh/ projecting heyond the upper. 

 Mouth of moderate width, the maxillary extending to below the 

 front margin of the orbit. Ventral fins in advance of the dorsal, 

 the origin of which is nearer to the root of the caudal than to the 

 end of the snout. Caudal fin moderately forked ; pectorals termi- 

 nating at some distance from the root of the ventrals. Three 

 longitudinal series of scales between the lateral line and the root of 

 the ventral fin. Sides of the body with a silvery band. 



Pharyngeal teeth 4 . 2—2 . 4. 



Lake Stiperior. 



This species cannot well bo referred to a genus which is distin- 

 guished from Leuciscus by a many-rayed anal fin. See also Ahramis 

 oligaspls, p. 309. 



