454 
STATION ITI. 
This includes the pond, and also the ditches within this region. 
INSECT LIFE. 
Limnotrechus marginatus. Water-strider. 
Corixa mterrupta. Water-boatman. 
Notonecta undulata. Back-swimmer. 
Culex sp. Mosquito. 
Zattha fluminea. Water-bug. 
Libellula basalts. Dragonfly (adult). 
MOLLUSKS. 
FLUVIATILE SPECIES. 
Musculium partumeium. Occasional. 
Physa gyrina. Very abundant. 
Segmentina armigera. Very abundant. 
Planorbis trivolvis. Common. 
Lymnea reflexa. Common. 
LAND SPECIES. 
Succinea retusa. Common. 
Succinea avara. Occasional. 
STATION IV. 
A small stream which drains from ditch beside Glencoe road into 
the center pond. Also, hollows in the wooded area which are filled 
with water in the spring. In the fall, all of these habitats are dry, 
and the dead shells of mollusks may be found scattered over the 
surface or under dead leaves. 
MOLLUSKS. 
FLUVIATILE SPECIES, 
Spherium occidentale. Very abundant. 
Aplexa hypnorum. Very abundant. 
Physa gyrina. Occasional. 
Segmentina armigera. Very abundant. 
Planorbis parvus. Rare. 
Lymnea caperata. Occasional. 
Lymnea parva sterki. Rare. 
LAND SPECIES. 
Succinea retusa. Common. 
Succinea avara. Occasional. 
