TEMPORARY POND COMMUNITIES 



175 



SEMI-TEMPORARY POND OR MARSH AND INHABITANTS 



FIG. 123. General view of Pond 93, which is occupied by Sa-gittaria and grass- 

 like plants. 



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



FIG. 1240. The same from above. 



FIG. 125. A temporary pond form of the snail (Lymnaea reflexa); natural size. 



