Shell-encrusted tubes were distributed in the northern portion of Lower Clam Bay and to a lesser extent in the southern portion of the Lower Tributary. These tubes were primarily collected on sand, shell and sandy mud substrate.
Molluscs Shells of stout razor clams, Tagelus plebeius, were the dominant component (47.7%; n = 104) of the mollusc assemblage, followed by shells of American oysters, Crassostrea virginica (38.1%; n = 83). Stout razor clam shells were typically found in Upper Clam Bay (Table 2; Fig. 10) at 53.6% of the sample sites (Table 3). These shells were collected on mud, sandy mud, muddy sand and sand substrates (Table 7). Oyster shell was found throughout the Clam Bay complex (Table 2; Fig. 10), but comprised a relatively high proportion of the sample sites in the Lower Tributary (64.3%; Table 3). With the exception of the aforementioned tributary, oyster shells were primarily collected on mud and sandy mud substrates (Table 7). A living oyster cluster was found in the northeastern portion of Upper Clam Bay and another in the central portion of the Lower Tributary, but the majority of living clusters were found in peripheral areas of Lower Clam Bay (Fig. 10). Living clusters were primarily collected with shell substrate, but were also collected with mud and muddy sand substrate in Lower Clam Bay (Table 7). Shells and living specimens of pointed venus clams (Anomalocardia auberiana) were primarily found in the central portion of Inner Clam Bay and the northern portion of Lower Clam Bay (Table 2; Fig. 10). Pointed venus clams were primarily collected on sandy mud substrate for the former bay and sand substrate for the latter (Table 7). Grass ceriths (Bittiolu varium) were only found in Lower Clam Bay at 6.1% (n = 26) of the sampling sites (Tables 2 and 3). These gastropods were primarily located in the northern and, to a lesser degree, west-central positions of this Bay (Fig.
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