240 A NATURALIST IN THE GREAT LAKES REGION 



FIG. 342. The snapping turtle 



snails, clams, and small crustaceans found abundantly here. In 

 the zone of submerged plants the shrimp Palaemonetes paludo- 

 sus (Fig. 56) is common, especially in the cooler waters. Here 



also one finds the large 

 gelatinous masses in- 

 closing colonies of the 

 polyzoan Pectinella 

 magnified. Here, too, 

 and in the zone of the 

 water lilies, the painted 

 turtle (Fig. 341) and 

 the snapper (Fig. 342) 

 are usually prevalent, 

 and such frogs as the 

 leopard, pickerel, green, 

 and bull. 



The bullfrog is known by his immense eardrums, much 

 larger than his eyes (Fig. 343). The leopard frog is yellow 

 below; above he is mottled with black blotches on a yellow 

 ground. The pickerel frog (Fig. 344) is light brown, marked 

 above with three rows of 

 squarish blotches. The 

 green frog is pale green 

 above, marked with black 

 blotches and is also pale 

 green below. 



The bulrushes afford 

 nesting sites for the marsh 

 wren, both long- and short- FIG. 343. Common bullfrog. Rana cates- 

 billed, that attach their beiana, male. Bulletin United States Fish 



globular nests to the rushes Commission - 



(Fig. 345), the black tern, the pied-billed grebe that build 

 floating nests sometimes also in the cat-tail zone. In the cat- 

 tail zone will be found nesting the red-winged and yellow-headed 

 blackbirds, the American (Fig. 346) and least bitterns. The 



