Occasional Papers of the Miisciun of Zoology 29. 



Habitat 45. Alder Szvanip. Along the edge of the swamp 

 bordering the East Branch a thicket was formed of such 

 shrubs as the tag-alder, dogwoods and a few small trees of 

 the white maple {Acer saccJmrinuin) and ash. The swamp 

 apparently contained water after heavy rains, although merely 

 damp at the time studied. Such plants as the marsh fern 

 (Aspidium thelypteris) , meadow rue (Thalictruni revolution) 

 and blue flag formed a scanty undergrowth along the edge 

 of and in the thicket. 



Habitat 46. Clearing near Foster City. A number of shells 

 were collected in and around old stumps and logs in what 

 appeared to be a cleared and drained tamarack-cedar swamp,, 

 near the bank of the East Branch just below Foster City. 

 This was one of the drier alluvial habitats. 



STREAM FLATS 



Habitat 4/. Hancock Creek Flats. The flood plains of this 

 creek, about two feet above the July level of the water, pre- 

 sented two facies : grassy swales and wooded flats. The prom- 

 inent plants of the former were grasses and sedges, mixed 

 with sensitive ferns {Onoclea sensibills), meadow-rue, swamp 

 milkweed {Asclepias incarnata) and Joe-pye weed (Eupato- 

 rium sp.). The wooded flats were carpeted with leaves and 

 shaded by tag-alders, red dogwoods {Cornus stolonifera) and 

 white maples. However, there appeared to be a uniform mol- 

 luscan fauna throughout the whole. 



Habitat 48. Menominee River Flats. In a damp hollow on 

 the flats of the Menominee River numerous shells were col- 

 lected from thickets under the leaves and sticks. This brush 

 consisted mainly of tag-alders, dogwoods, hazels (Corylus 

 americana) and small ashes. The maiden-hair fern (Adian- 

 tuni pedatum) and the poison ivy (Rhus toxicodendron, north- 



