LAMPREYS AND FISHES OF INDIANA. 



199 



jj. Teeth, 4-4 in main row, with none, 

 one, or two, in the inner row. 



Notropis, p. 205. 

 ii. Lower lip developed as a fleshy lobe on each 

 side ; teeth 4-4, without grinding sur- 

 face ; dorsal in front of the ventrals. 



Phenacobkis, p. 214. 

 gg. Scales of lateral line, sixty or more ; dorsal behind 

 the ventrals ; an obsolete barbel. 



Rhinichthys, p. 214. 

 ff. Maxillary with a barbel, sometimes minute. 

 ■ k. Premaxillaries not protractile; teeth, 2, 4-4, 2; 

 dorsal behind the ventrals ; scales, sixty or more. 



Rhinichthys, p. 214. 

 kk. Premaxillaries protractile. 



1. Teeth, 4-4 in main row ; none or one in inner 

 row ; scales along the lateral line, fewer 

 than sixty. Hyhopsis, p. 215. 



11. Teeth, 2, 4-4, 2, or 2, 4-4, 1, without grinding 

 surface ; scales along, lateral line, sixty or 

 more; head convex above. Couesius, p. 219. 

 ee. Teeth in the main row, 5-5 or 4-5. 



n. Teeth in two rows, 2, 4-5, 2, or 2, 5-5, 2. 



0. Maxillary with a small barbel, sometimes so 

 minute as to be easily overlooked. (In our 

 species scales of lateral line not more than sixty- 

 five.) Semotilus, p. 219. 

 00. Maxillary without barbel. (In our species scales 

 of lateral line, seventy or more.) 



Phoximis, p. 220. 

 nn. Teeth, one rowed, 5-5, and with grinding surface and 

 serrate edges, 

 p. Anal rays, eight ; dorsal over ventrals. 



Opsopoeodus, p. 221. 



pp. Anal rays, twelve to eighteen; dorsal behind 



ventrals. , Notemigonus, p. 221. 



2. Dorsal fin long, of about twenty rays, the front a stong serrated spine ; 



four long barbels about the mouth. Cyprinus, p. 222. 



Genus CAMPOSTOMA Ag. 



Mouth inferior. Teeth, 4-4, with a grinding surface, but no, hook. 

 Alimentary canal, six to nine times the length of the body, and wound 

 many times around the air-bladder. A single species. 



