Section 51. No person shall sell, or represent for the purpose of sale, any lobster as a native lobster unless the same shall have been originally caught or taken in the coastal waters; nor shall any person so sell, or represent for the purpose of sale, any crustacean as a lobster unless the same is of the species known as Homarus americanus; nor shall any person so sell, or represent for the purpose of sale, any meat as lobster meat unless such meat is wholly from crustaceans of such species.