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 
specimens of lobster that have ever been taken. They 
weighed when alive thirty-one and thirty-four pounds 
Crustaceans 
and Insects 
Marine Habitat Group. A community of starfishes, sea anemones, sea urchins and sponges as seen 
below the edze of a coral 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, 
Alcove NE including marine, fresh-water and land animals. All 
Mollusks mollusks have soft bodies, but nearly all of them secrete 
Models of a shell which in many species is of pearly material (mother- 
Clam and of-pearl). Well-known examples of this group are the° 
Cree 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. 
