Explanation of plate l 



Argulus foliaceus. 



Fig. I. — Stickleback, with two Arguli (adult female) attached. Two 



thirds size. 

 Fig. 2. — Ova of Argulus foliaceus, photographed under water. 



Magnified 15 diameters. 

 Fig. 3. — Larva, just emerged. X 36 diameters. 

 Fig. 4. — Female larva, third stage, x 15 diameters. 

 Fig. 5. — Adult male, x 15 diameters. 

 Fig. 6.— Adult female. X 15 diameters. 



