78 LaTce Maxinkuckee, Physical and Biological Survey 



of water, these forms are comparatively rare in Lake Maxinkuckee. 

 In certain rivers which we have examined, particularly the Kanka- 

 kee, Maumee, and the sloughs along the Mississippi, certain large 

 species of Lernsea are so abundant during the summer and fall 

 that they infest most of the rock bass, crappies, and bluegills. 

 They seemed to be worst on the rock bass, nearly every one of 

 which was bleeding in one or more places where these parasites had 

 fastened in their skin. At this season these fishes are said to be 

 "wormy" and are rejected by anglers and others who chance to 

 catch them. 



The Isopods or Sowbugs are represented at the lake by two 

 aquatic species, one in the lake proper, the other (PorcelUo scaber) , 

 in the woodland ponds and in damp places. The lake species is 

 abundant all the year round among the Chara, especially in Outlet 

 Bay. It is one of the most important foods, particularly of rock 

 bass and bluegills. It sometimes forms the greater part of the 

 food of those species. Little or nothing was learned of the habits 

 of the pond species. There are, of course, several land species of 

 these curious crustaceans. 



The Amphipods are represented by several species in the lake 

 and the neighboring ponds. A large species was found near shore, 

 and smaller forms farther out in the lake among the aquatic plants. 

 The Hornwort (Ceratophyllum demersum) was one of their favor- 

 ite haunts. Some of our herbarium specimens of this plant were 

 found full of these beach fleas. Many specimens were obtained 

 from the plants raked up from various depths. The Amphipods 

 could be obtained by washing the plants in a tub or bucket of water. 

 A few were taken at night in the towing-net. Some were found 

 in stomachs of fishes seined August 3 (1906), south of Arling- 

 ton station. 



The freshwater shrimp (Palaemonetcs exilipes) was not com- 

 mon in or about the lake. Only a few were obtained, one on Au- 

 gust 2 (1899), one on September 6 (1899), and one on October 

 23 (1900), all in the Outlet. Two were secured in Lost Lake, 

 one on August 1, the other September 1 (1900). Another was 

 taken November 27 (1900). upon a mass of aquatic plants dredged 

 some distance from shore in the lake. This species therefore ap- 

 pears to be rather rare at this lake. In Little River near Aboite, 

 Allen Co., Indiana, immense numbers of this shrimp were found 

 in masses of Ceratophyllum from which the transparent creatures 

 jumped with great alacrity when hauled up out of the water. They 

 were found in great abundance also in Chester River, near Chester, 

 Md. 



