The "Sachem" wreck is typical of the remains of many unknown wooden sailing ships that are found off the coast. Three parallel sets of ribs and scattered decking between provide good habitat for lobster. The wreck sits in 60' of water on a clean sandy bottom and visibility is usually good on this site. Fairly large and scattered, it also provides a good opportunity for the spearfisherman.
These creatures are all of the order Gastropoda - having a single, often coiled, shell, as opposed to the bivalves, which have two matching shells. Most snails are hermaphroditic. Also, most snails have a right-hand twist to the shell, although there are exceptions.
Right:
X-ray image of a Channeled Whelk, showing internal structure.
Nudibranchs are a form of snail that has lost its shell, while Corollas and Sea Butterflies are snails that have abandoned not just their shells, but the snail-like existence entirely, swimming up into the water column as plankton.
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