464 
Animal life was fairly abundant, the invertebrates being as 
follows. 
INSECTS. 
Limnotrechus marginatus. Water-strider. 
Corixa interrupta. Water-boatman. 
Notonecta undulata. Back-swimmer. 
Zattha fluminea. Water-bug. 
Tropisternus dorsalis. Water-beetle. 
Cybister sp. Larva of water-beetle. 
Sympetrum rubicundulum. Dragonfly (nymph). 
Libellula basalts. Dragonfly (adult). 
Anax junius. Dragonfly (nymph). 
MOLLUSKS. 
FLUVIATILE SPECIES. 
Physa gyrina. Abundant. 
Segmentina armigera. Common. 
Lymnea reflexa. Rare. 
LAND SPECIES. 
Succinea retusa. Rare. 
STATION XV. 
(Plate XIV.) 
An open area about thirty-five feet in diameter in the midst of a 
rather thick growth of trees. The ground is covered with dead 
leaves, dead branches and other forest debris. 
The forest surrounding the area includes the following species: 
Quercus bicolor. Swamp White Oak. 
Carya ovata. Shellbark Hickory. 
Ulmus americana. American Elm. 
Under the leaves and in cracks in the dry earth the following 
mollusks were found. 
FLUVIATILE SPECIES. 
Spherium occidentale. Common. 
Physa gyrina. Very rare. 
A plexa hypnorum. Common. 
Lymnea caperata. Rare. 
LAND SPECIES. 
Succinea avara. Rare. 
