150 POND COMMUNITIES 
painted turtle (Chrysemys marginata) is abundant, basking on the fallen 
trees. The geographic turtle and the snapping turtle are found also 
in the younger phases. Garter-snakes pick up their food along the 
ponds (Fig. 114), while muskrats, occasional minks, and various aquatic 
birds (108) feed in the ponds. 
SENESCENT POND INHABITANTS 
Fic. 109.—A leech with young attached to the ventral side (Placobdella para- 
sitica); natural size. 
Fic. t10.—The larva of a netted-winged insect (Chauliodes rastricornis). 
Fic. 111.—Pupa of the same (slightly enlarged). 
Fic. t12.—A snail (Planorbis trivolvis); natural size. 
Fic. 113.—Common amphipod (Eucrangonyx gracilis); twice natural size. 
Fic. 114.—Pond 58 in a dry season, showing dead fish (mud minnows) both 
on bottom and out of water and in the water. A garter-snake (Thamnophis sp.) 
feeding on the fish. 
Consocies of logs.—This is the chief place to find the sponge and the 
polyzoa. Their numbers vary from year to year but they are usually 
