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 

 magnifica. Here, too, 

 and in the zone of the 

 water hlies, 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 bei^^^,^ male. Bulletin United states Fish 

 , , , J j^ .^ i_ Commission. 



globular nests to the rushes 



(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 



