28 PRELIMINARY REPORT 



Genus CAMPOSTOMA Agassiz. 



Campostoma anonialum (Rafinesque). Stone Roller. Stone Lugger. Steel- 

 backed Chub. Mammy. Dough-belly. 



Color brownish with a slight yellowish luster; scales mottled 

 with brown; a dark bar behind the opercles; a dark bar across 

 the dorsal and anal fins, the remainder of these fins bright red in 

 the spring males. The most characteristic point about this fish is 

 The great length and peculiar arrangement of the intestines, which 

 is w^ound many times around the air-bladder. It needs but one 

 peep at the internal anatomy of this fish to determine its genus. 

 Snout somewhat decurved; scales small and crowded forward, 

 7-53-8. Dorsal fin with 8 rays. Anal 7. Teeth 4-4. Length 4 to 8 

 inches. Not very common in Minnesota. Specimens have been 

 taken in the Minnesota and Blue Earth rivers at Mankato, where 

 i1 is quite common (Cox, 1891-5); Pomme de Terre river at Apple- 

 ton (Woolman & Cox, 1892). 



Genus CHROSOMUS Eafinesque. 



Chrosomus erythrog^aster Rafinesque. Red-bellied Dace. 



Body not much compressed, oblong, largest in the middle and ta- 

 pering towards each end. Head somewhat pointed; mouth terminal, 

 oblique, jaws equal or about so. Fins not large, the dorsal and 

 anal high and short. General color brownish olive; a dark dorsal 

 line and sometimes black spots ; two dark bands on each side with 

 a silvery band between them; a black spot at the base of the caudal 

 fin; belly silvery; spring males with the belly, space between the 

 dark lateral bands and the bases of the vertical fins scarlet; occa- 

 sionally the body is covered with tubercles and the fins are bright 

 yellow; females not so conspicuously marked. Head 4 in length. 

 Depth 4. Dorsal rays 7. Anal 8. Scales small, 16-85-10, not over- 

 lapping much. Pharyngeal teeth usually 5-5. Length 2 to 3 

 inches. Not common in Minnesota so far as known. It has been 

 reported as rare at Austin by Dr. S. E. Meek (Bull. U. S. Fish 

 Comm. X, 1890, p. 233). 



Genus HYBOGNATHUS Agassiz. 



Hybognathus nuchalis Agassiz. Silvery Minnow. 



Intestine long, 7 to 10 times the length of the body. Color sil- 

 very with bright reflections, darker above; color varies greatly 

 with the conditions. Body rather slender; head rather short; 



