FISHES OF MINNESOTA 'J 



Genus ICHTHYOMYZON Girard. 

 KEY TO THE SPECIES OF ICHTHYOMYZON. 



A. First row of teeth above the mouth (supraoral lamina, or max- 

 illary tooth) two pointed (bicaspid); no bicuspid teeth on 



the sides of the mouth. concolor, 



AA. First row of teeth above the mouth three pointed (tricuspid) , 



some of the teeth on each side of the mouth bicuspid. castaueus- 



Ichtbyomyzoii concolor (Kirtland). 



The row of teeth above the mouth consists of two cusps; row be- 

 low the mouth with 7 cusps; all the other teeth simple and ar- 

 ranged in about four concentric circles around the mouth. Head 

 contained 7^ times in the length. Head with gills contained 4f 

 times in the length. Fifty-one muscular bands between the last gill 

 opening and the vent. Color bluish, occasionally marked with 

 dark spots; a blue spot above each gill opening. Generally small 

 but individuals may reach a length of 12 inches. Very common 

 in the Lake of the Woods, where it is parasitic on the sturgeon and 

 other large fish. Twenty-eight fine specimens were taken in the 

 above mentioned region in 1894 (Nat. Hist, Surv.). 



Ichthyomyzon castaneiis Girard. 



Three closely set teeth in the first row above the mouth; a row 

 of bicuspid teeth on each side of the mouth; 7 to 12 pointed teeth 

 in the row below the mouth; all other teeth simple and somewhat 

 hooked; teeth of this species a little longer than those of the next. 

 Dorsal fin continuous with the caudal but broadly notched. Color 

 somewhat yellowish, varying to brown. Length 10 inches. A speci- 

 men taken in 1853 by Dr. Geo. Suckley is listed from Galena, Minn., 

 in the Kept Pac. R. R. Surv., Fishes, p. 381, by Charles Girard. 

 The same is referred to in Jordan & Gilbert's Synop-j-is, :?fj -i. 

 Three specimens of Lamprey from the Red Lake River are iift*\ea 

 as Ammocmtes hrancMalis by Prof. A, J. Woolman (Report U. S. 

 Fish Comm., 1893, p. 3G9). I have examined one of the specimens 

 taken by Mr. Woolman, and it is evidently P. castaneus. Its 

 supraroral lamina consists of 3 closely set teeth, there is a row of 

 4 bicuspid teeth on each side of the mouth and the infraroral 

 lamina (the row below the mouth) has 7 cusps. A poorly preserved 

 specimen was taken from the Minnesota River at Mankato in 1892 

 which seems to be this species. 



