9. Insects and Spiders.
SNAILS AND THEIR TRACKS ON THE BEACH
—Photograph by Mary C. Dickerson.
Seashore Life
Because of their connection with our industries or our food supply, some of the Invertebrates are familiar to all; for instance, sponges, corals, starfishes, crabs, shrimps, lobsters, clams, and oysters. Others are seldom seen unless one takes pains to look for them.
JELLY FISH
All life comes from pre-existing life. So every animal living to-day has come from some other living animal and every plant living to-day has come from some other previously living plant. It is believed that the first forms of life came from the water. At any rate, the oldest and lowest forms of life to-day, the Protozoa, are found in the water. As these are nearly all very minute and can be studied only with a microscope, they are omitted from the suggested field work.
ANIMALS OF THE WHARF-PILES
Habitat Group in the American Museum of Natural History