1909.] 



NATURAL SCIENCES OF PHILADELPHIA. 



383 



and III), as indicated in the sketch. The open water (sp. gr. 1.016) 

 of the first lagoon (II) is completely surrounded by a circumarea 

 (sp. gr. 1.016) of Spartina stricta maritima (X), in the midst of which 

 arises an association of Spartina polystachya ($). This circumarea 

 is in turn surrounded by a continuous one (sp. gr. 1.018) of Baccharis 

 halimifolia (9), in front of which in two small associations (sp. gr. 

 1.020) occur Spartina patens (V), together with Salicornia herbacea 



Fig. 3.— Survey of Salt Marsh on Plum Island, Sandy Hook Bay, marked II 

 on the Sketch Map of the island. X, Spartina stricta maritima; $, Spartina 

 polystachya; O, Baccharis halimifolia; dotted area = sand; V, Spartina 

 patens; H, Salicornia herbacea; P, Prunus maritima; A, Ammophila are- 

 naria; t , thicket of trees. 



(H ). In one corner of the marsh (sp.gr. 1.0185), just back of the 

 Baccharis halimifolia (#), is found an extensive association of Spartina 

 patens (V), which touches the sandy slopes covered with Ammophila 

 arenaria (A) and Solidago sempervirens. This dune strip merges into 

 the thicket formation previously described, where Prunus maritima 

 (P) occupies the outer edge of tree growth (see Fig. 3). 



