7 88 



FRESH-WATER BIOLOGY 



12 Abdomen medium, oval, anal sinus short, slit-like, papillae sub- 

 terminal Argulus versicolor Wilson 1903, female. 



Anal papillae subterminal; bases of antennae close to mid- 

 line of carapace; found on the common pickerel, Lucius 

 reticulatus. 



FIG. 1242. Argulus versicolor, female. (After Wilson.) 



13 (n) Carapace elliptical, longer than wide. 14 



14 (15) Flagella on anterior swimming legs. 



Argulus lepidostei Kellicott 1877. 



Carapace elliptical, longer than wide, its lobes very short, 

 barely covering two pairs of legs; abdomen broad, triangu- 

 lar, cut to the center or beyond with acute lobes; found on 

 the gar pike, Lepidosteus osseus. 



FIG. 1243. Argulus lepidostei. (After Wilson.) 



15 (14) Flagella on all four pairs of swimming legs. 



Argulus ingens Wilson 1912. 



Male 1 6 mm., female 21 to 25 mm. long. By far the largest American species. From the 

 alligator gar, Lepidosteus tristoechus, in Moon Lake, Miss. 



16 (10) No flagella on swimming legs. . . A rgulu s stizostethi Kellicott 1880. 



Carapace elliptical, longer than wide; abdomen elongate, cut to the center or beyond; the 

 lobes lanceolate-acuminate; found on the blue pike, Stizostedion canadense. 



IMPORTANT PAPERS ON FRESH-WATER COPEPODA 



VAN DOUWE, C., and NERESHEIMER, E. 1909. Copepoda. Die Siisswasser- 

 fauna Deutschlands. Heft n. * 



FORBES, ERNEST B. 1897. A Contribution to a Knowledge of North Ameri- 

 can Fresh-water Cyclopidae. Bull. 111. State Lab. Nat. Hist., 5: 27-82; 

 13 Pi- 



