
SOUTHEAST PAVILION 
INVERTEBRATES 
At the extreme east is Darwin Hall, devoted chiefly to the invertebrate 
animals (those which do not possess a backbone). The installation in the 
alcove cases is designed to give a synopsis of the Animal Kingdom and the 
: relationships existing between the various groups. Passing 
Synoptic 
: around the hall from left to right, the progression is from the 
Series 
lowest forms of animal life, the one-celled Protozoa, to the 
highest and most complex forms of animal life, the Primates, including 
man. The distinctive characteristics of each group are fully described on 
the alcove and case labels. Many of the invertebrates, particularly among 
the lowest forms, are so small and their structures are so minute, that 
they can be seen only by the aid of a magnifying glass. In such 
instances the specimens are represented by skilfully prepared models in 
glass and wax showing the animal many times enlarged. Thus the visitor 
may obtain an idea of the form and structure of these animals which in 
spite of their small size have in so many instances such a vital influence on 
the life of man. 
This alcove contains the lowest forms of animal life. All are single- 
celled individuals. They are found in stagnant water, and the ocean bottom 
in many 
ee localities 
Protozoa | 
is covered 
with them. The 
specimens exhibited 
in this alcove are 
models, some of 
which are enlarged 
more than a thou- 
sand diameters. 
Sponges are of 
two kinds. ‘Those 
with skeletons or 
supporting — struc- 

tures of silica (i. e. 
Al flint) and European commercial sponge comparable with the Florida 
cove 2 those with yellow sponge or ‘‘Hardhead.’’ The sponge industry in both 
Sponges the Mediterranean and the Bahama region is almost destroyed 
skeletons by careless methods, and conservation must be practiced here as 
of horn. The sponges in other of the world’s resources 
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