Bull. U. S. F. C, 1890.— (To face page H.) Fishes from ihe Lower Fotomac River, 
PLATE XX. 
GAMBUSIA PATRUELIS. Top Minnow. Female. Two and one half times natural size. 
MeNIDIA BERYLLINA. Silversides. One and one-fourth times natural size. 
PARALICHTHYS DENTATUS. Summer Flounder. Immature. Two-thirds natural size. 
