. U. S. F. C. 1890. — (To face page 72.) Fishes from' 
Lower Potomac River. 
Plate XVIII. 
CYPRINODON VARIEGATUS. Variegated Minnow. Male. 
Twice natural size. 
CYPRINODON VARIEGATUS. Variegated Minnow. Young. Six times natural size. 
ZYGONECTES LUCI/C. Male. Four times natural sis 
