National Geographic : 1949 Jul
0 National G(eographlliSocicety 42 1oniurlnme ny [lln i New England's "Stern and Rockbound Coast" Teems with Mollusk Shells of Many Kinds When the cold tides, which rise and fall 10 feet and more, draw back from narrow beaches, they expose these treasures of the sea. The Thais (1) in upper corners is a sharp-pointed snail with marblelike texture. Below are familiar periwinkles (3), which cover rocks and seaweed in droves and make excellent bait for small fish caught with hook and line. The larger round specimens (5) are Moon Shells, famous for their filelike tongues with which they saw into clams and mussels. (1) Thais lapillus; (2) Littorina obtusata; (3) Periwinkles, Littorina littora; (4) Jingle Shell, Anomia simplex; (5) Polinices heros; (6) Limpets, Acmaea test dinalis; (7) Mussels, M ytilus cdulis, (8) Mytilus edulis, and (9) l'olsella mdodiolus; (10) Clam, Venus mnercenaria.