Hvirvelløse Havdyr

1. Tunicate (sea squirt)
2. Anemone (sea flower)
3. Chitin
4. Hermit crab
5. Brittle star or serpent star
6. Sea urchin
7. Sea cucumber
8. Bryozoa colony (moss animal)
9. Barnacle
10. Common starfish
11. Mussel or clamworm
12. Jellyfish
13. Limpet
14. Tube worm
15. Oyster
16. Amphipod (sand flea)
17. Sponge
18. Sand dollar
19. Coral
20. Ghost crab

1. Three kinds of crabs
2. One kind of starfish
3. Any other five animals listed in requirement No. 1

Hard-bodied animals, such as crabs, starfish, and chitons, may be killed in a 5% solution of formaldehyde or a 70% solution of alcohol, and then dried by a fire. The sun will cause the color to fade. Soft- bodied animals must be kept in a 3% solution of formaldehyde or a 70% solution of alcohol. If commercial formalin is used in place of formaldehyde, the above percentage figures should be doubled.

1. The swimming action of a jellyfish
2. The method of an anemone capturing food
3. The running of a crab
4. How does a starfish digest a clam or oyster when it has such a small mouth opening?

1. What relationship do crabs and barnacles have to insects?
2. What relationship does the sea squirt have to man?
3. Name a common land dweller that is related to the clamworm.
4. The octopus belongs to the phylum Mollusca. Which two animals listed in No. 1 are related to the octopus?

1. Visit a seashore at night and by means of a flashlight observe the activity of animals on shore and in the water. Notice the thousands of plants and animals visible when the beam of light is directed into the water. These minute organisms are called plankton.
2. Tow a fine-mesh cloth or regular plankton net through the water and observe through a microscope the many tiny animals and plants that are collected.
3. Select three items under No. 1 that are important economically. Explain why they are important.