Explanation of Plates. 



All the figures given as original are drawn to scale, the accompanying line 

 expressing a fraction of, or one or more, millimeters. Figures taken from 

 other works are always mentioned with reference to their source. 



Plate i. 



Eubranchipus vernalis (Verrlll). 



Male, original, upper figure ventral view, lower figure lateral view. Para- 

 dise, Lancaster County, Pa. March, 1891. Witmer Stone. 



Plate 2. 

 Eubranchipus vernalis (Verrill). 

 Female, original, data otherwise as preceding.. 



Plate 3. 

 Ino holmanii (Ryder). 



Male, original, upper figure ventral view, lower figure lateral view. Chin- 

 coteague, Va. May, 1912. T. D. Keim and H. W. Fowler. 



Plate 4. 



Streptocephaius sealii Ryder. 



Male, original, upper figure ventral view, lower figure lateral view. Wood- 

 bury, N. J. W. P. Seal. (Type.) 



Plate 5. 

 Streptocephaius sealii Ryder. 



Female, original, same data as preceding. . 



Plate 6. 



Eurycercus lamellatus (Miiller). 



Example without eggs to left, and female with eggs, originals. South 

 Dennisville, N. J. April, igi2. H. W. Fowler. 



Plate 7. 

 Chydorus sphaericus (Miiller). 

 Original. Tributary of Delaware River near Florence, N. J. May, 1912. 

 H. W. Fowler. 



(631) 



