196 REPORT OF STATE GEOLOGIST. 



Depth in the length, three and three-fourths ; head in length, three 

 and two-thirds. Dorsal rays, twenty-three ; anal, eight. The anterior 

 dorsal ray sometimes reaching backward beyond the base of the fin. 

 Scales, 7-36-6. Opercle striated. Color brilliantly silvery, especially 

 on the cheeks and opercles. Upper surface olivaceous silvery. Length, 

 not more than one foot. 



Ohio Valley ; not a common fish. Vigo County (33, '88, 55) ; Lower 

 Wabash River (7, 77, 45); Vincennes, Patoka, New Harmony (4, 

 '88, 162); Evansville, U, '88, 165); Eel River, at Logansport (4, '88, 

 158). Prof. Cope's types of this species came from the " Wabash River," 

 probably at Lafayette 



ICTIOBUS THOMPSON! (Ag.). 



Jordan and Gilbert, 1882, 8, 883 ; Carpiodes thompsoni, Jordan and 

 Gilbert, 1882, 8, 119. 



Body deep and compressed, the back sharp. Depth in the length, 

 two and three-fifths. The dorsal outline much arched between the head 

 and the dorsal fin. Snout sharp, projecting beyond the mouth. Mouth 

 small, ashaped, and wholly inferior. Lips thin. Head, in length, four 

 and one-fourth. Eye in head, five and one-half. Dorsal fin with twenty- 

 six rays, the longest reaching to the hinder end of the base of the fin. 

 Anal, seven. Scales, 9-41-7. Resembles I. velifer, except that the 

 head is smaller, the snout sharper and more projecting. Said to be 

 abundant in the Great Lakes ; is, therefore, no doubt an inhabitant, or 

 occasional visitant, of the Indiana shores of Lake Michigan. It is given 

 by Nelson in his catalogue of the fishes of Illinois (I4., JSTo. 1, 49), as oc- 

 curring in Lake Michigan. 



Genus CYCLEPTUS Rafinesque. 



Body elongated, moderately compressed. Mouth inferior. Pharyngeal 

 bones with comb-like teeth. Air-bladder in two parts. Dorsal fin long, its 

 rays about thirty in number. Scales small, about fifty-six in the lateral 

 line. No fontanelle present between the parietal bones. A genus eontaia- 

 ing a single species. 



CVCLEPTUS ELONGATUS (LeS.). 



Blark-horse. 



Jordan and Gilbert, 1882, 8, 121 ; Jordan, 1884, 12, 615, pi. 224. 



Body elongated and moderately compressed ; depth in length, four to 

 four and one-fourth ; back more or less arched from the dorsal to the 

 back of the head. Head small, narrow and pointed, the snout projecting 

 bevond the mouth. Head in the length, five and one-half. Mouth of 



