TEMPORARY POND COMMUNITIES 



175 



Semi-temporary Pond or Marsh and Inhabitants 



Fig. 123. — General view of Pond 93, which is occupied by Sagittaria and grass- 

 like plants. 



Fig. 124. — Side view of a red-winged blackbird's nest. Photo by T. C. Stephens. 



Fig. 124a. — The same from above. 



Fig. 125. — A temporary pond form of the snail (Lymnaea reJIexa): natural size. 



