EXPLANATION OF PLATES. 633 



Plate 17. 

 Cyclocypris laevis (Miiller). 

 Original. Upper figure lateral view, lower figure dorsal view. Length of 

 specimen about 0.45 mm. From tributary of Crosswicks Creek near Tren- 

 ton, N. J. June, 1912. H. W. Fowler. 



Plate 18. 

 Cypria dentifera Sharpe. 



Original. Upper figure lateral view and lower figure dorsal view of an- 

 other example, possibly identical. June, igi2. Tributary of Crosswicks 

 Creek near Trenton, N. J. Length of both specimens figured about 0.60 mm. 



Plate 19. 

 Naobranchia pomolobi Fowler. 



Original. Dorsal, lateral and ventral views of type, reading from left to 

 right. From gills of Pomolobtis ccstivalis taken in the Delaware River at 

 Tullytown, Bucks County, Pa., May 28th, 1912. H. VV. Fowler. 



Plate 20. 

 Lernean parasites on Fishes. 



Original. Upper left figure Fmidulus hctci'oclitus )iiacrolepidotus, Menidia 

 nienidia notata upper right figure, and lower figure Brevoortia tyrannus. All 

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



Plate 21. 

 Lerneaenicus radiatus (Le Sueur). 



Original, Females, left figure dorsal view, right figure lateral view, and 

 middle figure ventral view. From Brevoortia tyrannus' secured at Chinco- 

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



Plate 22. 

 Pennella filosa (Linnaeus). 



Original. Female, found parasitic on Mala mala and brought to Port Rich- 

 mond in Philadelphia, Pa. Capt. John L. Howard. Left figure ventral vew, 

 showing parasitic barnacle {Concho derma virgata) attached to its abdomen, 

 median figure lateral view, and right figure dorsal view 



Plate 23. 

 Pennella sagitta (Linnaeus). 

 Copied from Nordmann (Mikr. Beitr., 1832, PL 10, fig. 6). Female. 



Plate 24. 



Lerneoceropsis septemramosus Fowler. 



Original. Females, left figure dorsal view, middle figure ventral view and 



right figure lateral view. Type, from Poinolobus pseiidoharcngns taken in 



the Delaware River at Tullytown, Bucks County, Pa., May 28th, 1912. H. W. 



Fowler. 



