59 



are found in the Cove in the late fall. Specimens from the 

 Cove average larger than those from the creeks. 



Of the Amphibia typical of this zone, there is a preponder- 

 ance of the larval stages. Nedurus maculosus is common in 

 the creeks, and occasionally is taken in the Cove. Diemidylus 

 viridescenSf the only other aquatic adult, is found in marginal 

 pools. One other species of the Urodela, Amhy stoma punc^ 

 tatum, and eight species of Anura migrate to the swamp in the 

 spring to deposit their eggs. Their larvae, which throng the 

 pools, properly belong to this zone. They are : 



Bufo americanus (Le Conte) American Toad 



Hyla versicolor (Le Conte) Common Tree Toad 



Hyla pickeringii (Holbrook) Peeper 



Rana pipiens (Schreber) Leopard Frog 



Rana palustris (Le Conte) Pickerel Frog 



Rana damata Daudin Green Frog 



Rana cateshiana Shaw Bull Frog 



Rana sylvatica Le Conte Wood Frog 



As a general rule, egg-laying and the appearance of tadpoles 

 occur from a few days to a week earlier in the swamp than on 

 the uplands. 



Of the reptiles, the three that occur in the marsh belong 

 more properly to the habitat next considered. 



II. The Shore-line Association. 

 (Plate IV, fig. 1.) 



This is a very complex association, and might well be divided 

 into several lesser societies. Crowding out into the open water 

 is a zone of bulrushes (Scirpus validus), very scattering at its 

 outer edge but becoming much denser in the shallower water. 

 Shoreward from this zone is a strip of burreed (Sparganium) y 

 water horsetail (Equisdum), arrowhead (Saggitaria) and water 

 plantain (Alisma), Shoreward from this is an area of pickerel 

 weed (Pontederia), arrow arum (Peltandra), water dock 

 {Rumex)y loosestrife (Lysimachia) j and the like. The shore- 

 line association forms a transition from the open water to the 

 true marsh vegetation. In places the zonal arrangement is 

 quite complete, in others, very fragmentary. 



