Economics.

Write a short account of the following:—

  1. Oyster culture.
  2. Typhoid-fever and oysters.
  3. Clams, scallops, and other edible shellfish.
  4. Pearls and pearl fisheries.
  5. Fresh-water clams and the button industry.
  6. Sepia, Tyrian dye, etc.
  7. Harmful and useful mollusks.
  8. The work of U. S. Fish Commission in propagating clams.
Natural history.
  1. Give the class, habitat, and some important fact about each of the following: Pectens; wing shells; Tridacna gigas; abalones; limpets; oyster drill; periwinkle; mussel; cuttle fish; octopus; nautilus; argonaut.

6. A COMPARATIVE STUDY OF EXOSKELETONS

Materials.

Charts, specimens, etc. Since this is partly a review exercise, your notes and drawings of invertebrates should be at hand.

Definitions.

Exoskeleton, a protective covering developed on the outside of an animal.