This publication provides information and activities for teaching about seashells and process skills including observing, classifying, collecting and interpreting data, inferring, measuring, and predicting. There are 10 lessons. Lessons 1 through 5 deal with an introduction to shells, why animals have shells, observing and classifying shells, the practice and expansion of classifying shells and naming common shells. Lessons 6 through 10 pertain to studying and taking a closer look at clams, bivalves, univalves, limpets, whelks, and cockles. Also contained in this unit are: (1) a list of materials needed for activities; (2) information on the use of process skill terminology with students; (3) a list of objectives by lesson; (4) a vocabulary list with definitions; (5) teacher background information; (6) worksheets, two quizzes, and a unit test; and (7) appendices A, B, and C which supply recipes, craft ideas, and additional teacher background information. (RT)