461 
shells being scattered over the mud and in the cracks in endless pro- 
fusion. Only about three per cent. of the shells contained living 
animals. 
The vegetation of this station is as follows. 
On the Dry Bottom. 
Ranunculus multifidus. Yellow Water-Crowfoot. 
About the Border. 
Iris versicolor. Large Blue Flag. 
Crategus punctata. Large-fruited Thorn. 
Tilia americana. Basswood. 
Ulmus americana. American Elm. 
Mollusks as listed below were obtained. 
FLUVIATILE SPECIES. 
Musculium partumerum. Common. 
Physa gyrina. Very abundant. 
Segmentina armigera. Rare. 
LAND SPECIES. 
Succinea retusa. Rare. 
INSECTS. 
Notonecta undulata. Back-swimmer. 
Corixa interrupta. Water-boatman. 
Zattha fluminea. Water-bug. 
STATION XI, 
A small stream, dry in summer, extending from Station X, in*a 
curved direction, to the railroad embankment. The bed of the 
stream is about a foot in width, but in the spring the water covers 
the area to a width of from two to five feet. 
The following plants were noted in the immediate vicinity: 
Onoclea sensibilis. Sensitive Fern. 
Ribes floridum. Wild Black Currant. 
Crategus punctata. . Large-fruited Thorn. 
Carya ovata. Shellbark Hickory. 
Stum cicutefolium. Hemlock Water-Parsnip. 
Quercus bicolor. Swamp White Oak. 
Caltha palustris. Marsh Marigold. 
Anemone canadensis. Canada Anemone. 
