30 INVERTEBRATES. CRUSTACEANS AND INSECTS 
in the center of the alcove is a model showing the anatomy of the 
common lobster, also enlarged models showing heads of various 
species of insects. On the wall are the two largest 
Crustaceans . 
and Insects Specimens of lobster that have ever been taken. They 
weighed when alive thirty-one and thirty-four pounds 
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Marine Habitat Group. A community of starfishes, sea anemones, sea urchins and sponges as seen 
below the edge of a. Goral reef in the Bahamas. 

| | _ respectively. The largest.of the arthropods is the giant crab of Japan, 
which, like that placed on the wall, may have a spread of about ten 
feet. The main exhibit of insects is displayed on the third floor. 
The mollusks form a group second only to the arthropods in the 
vast number and diversity of forms which it embraces, 
AMeove 14. including marine, fresh-water and land animals. All 
Mollusks mollusks have soft bodies, but nearly all of them secrete 
Wiedels of a shell which in many species is of pearly material (mother- 
ee of-pearl). Well-known examples of this group are the 
common clam and oyster and enlarged models in the 
center case show the anatomy of these species. A large 
collection of mollusks is shown on the third floor. 

