Assertion: soft shell clam's shell | /r/HasProperty | the pacific littleneck clam
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text: The most common West Coast hard-shells are the Pacific littleneck clam (also know as a hardshell or rock clam ), growing up to 2.5 inches across; the pismo , a large clam from California with a minimum legal size of 4 1/2 inches across; and the small, sweet butter clam from the Pacific Northwest.