300 SMITHSONIAN MISCELLANEOUS COLLECTIONS [voL. 48 
4, 2) and sharp-edged or without grinding surfaces. More than a 
score of species are recognized by Jordan and Evermann. The 
type and best known is the Notropis atherinoides, “the largest and 
Fic. 37.—Notropis atherinoides. After Agassiz. 
handsomest species ” of the section; it occasionally attains a length 
of six inches and is “abundant in lakes, quiet places and river 
channels” in the Great Lake basin as well as in the Ohio and 
Mississippi valleys. 
Fic. 38.—Notropis cornutus, female. After Baird. 
Fic. 39.—WNotropis cornutus, male. After Agassiz. 
Another and one of the best marked sections has been designated 
as Luxilus. It is distinguished by the high and closely imbricated 
scales so that the exposed portions are unusually narrow in propor- 
