7 —S OS” ae ee aon al a ih 7 To. Tse 
\ 

32 FIRST FLOOR, SOUTHEAST PAVILION 
diversity of forms which it embraces, including marine, fresh water and 
a ee land animals. All mollusks have soft bodies, but nearly all of 
cove ues tis sate 
them secrete a shell which in many species is of pearly - 
Mollusks & any species is of pea ) mate 
rial (mother-of-pearl). Well-known examples of this group 
are the common clam and oyster and enlarged models in the 
Model of center case show the anatomy of these species. The largest 
Clam and Fae a ; Cs 
Oyster species is the huge “bear’s paw”’ or furbelowed clam of the 
‘astern seas. 
Vertebrates include the largest, most powerful and most intelligent 
of animals. The group culminates in man who still bears 
witness to his chordate ancestry in the retention of a chorda 
and gill clefts during embryonic life. The models in the 
Alcove 12 
Vertebrates 
central case show the development of the egg of typical vertebrates. 
An exceptionally large specimen of beautiful madrepore coral is in the 
case near the entrance, and the associations of marine life that may be found 
among the coral reefs of the Bahamas are represented by 
several smaller groups in the center of the hall. Certain of 
the groups in this section of the hall illustrate various biological principles 
Coral 
associated with the name of Darwin. The variation in form, size and color 
of the snail and the variation of the shell of the common scallop are 
graphically shown. 

Anopheles. Culex 
BODY AT AN ACUTE ANGLE T0 THE SURFACE BODY PARALLEL TO THE SURFACE 
ON WHICH THE INSECT RESTS. ON WHICH THE INSECT RESTS. 
Characteristic resting positions of malarial and common mosquitoes 
Four large models in the center of the hall show the mosquito which is 
the cause of the spread of malaria. These models represent 
Models of the insect enlarged seventy-five diameters or in volume four 
the Malarial hundred thousand times the natural size. The mosquito in 
REDO development undergoes a metamorphosis. The model 
at the left shows the aquatic larval stage; the larvee are the “wrigglers”’ 
of our rain water barrels. The next model is the pupal stage, also aquatic. 
The third model is of the adult male mosquito which is harmless since it 
never bites man. The fourth model shows the adult female mosquito in 
the attitude of biting. In another case is a series of models showing the 
life cycle of the malarial germ in the blood of man and in the mosquito. 
[Return to the elevators. | 

