1. Barnett, B.E. 1979. A laboratory study of predation by the dog-whelk Nucella lapillus on the barnacles Elminus modestus and Balanus balanoides. J. mar. biol. Ass. U.K., 59, 299-306.
2. * Engle, J.B. 1940. The oyster drills of Long Island Sound. Conv. Addr., Nat. Shellf. Assoc., New Haven, Conn.
3. * Federighi, H. 1931. Studies on the oyster drill (Urosalpinx cinerea Say ). Bull. U.S. Bur. Fish., 47: 83-115.
4. * Galtsoff, P. S., H.F. Prytherch and J. B. Engle. 1937. Natural history and methods of controlling the common oyster drills (Urosalpinx cinerea Say and Eupleura caudata Say). U. S. Bur. Fish. Cir., No. 25, 1-24.
5. Moore, H. B. 1938. The biology of Purpura lapillus. Part III. Life history and relation to environmental factors. J. mar. biol. Ass. U. K., 23, 67-74.