Called littlenecks on the East Coast and Pacific littlenecks on the West Coast, these small, hard-shell clams have a shell diameter of less than 2 inches. They're usually reserved for eating on the half shell. See also clam.
From The Food Lover's Companion, Fourth edition by Sharon Tyler Herbst and Ron Herbst. Copyright © 2007, 2001, 1995, 1990 by Barron's Educational Series, Inc.