SYSTEMATICALLY ARRANGED BY DR. T. T. KAUP. 
These five classes, in which the five systems which have been 
pointed out appear, make of themselves a particular subkingdom, 
which may be classified, even if the other two subkingdoms did 
not exist on earth. In the last two subkingdoms, viz . — Insecta 
and Radiata , the same systems appear, but much less clearly in- 
dicated ; and I only cite the single classes, because they illustrate 
each other, and aid reciprocally to prove the propriety of their 
arrangement. Thus, for instance, the Spiders are the nerve ani- 
mals, the Insects are the respiratory animals, the Crustacea are 
the bone, the Annelides are the nutrition, and the Cirrhipedes are 
the genital animals of their kingdoms. As the birds have their 
proper station only betwixt the mammalia and the reptiles, we 
have the insects as being analogous to the birds, their true station, 
betwixt the Arachnides and the Crustacea. For these reasons 1 
give a survey of all the classes. 
A. True or Real Animals. 
I. Mammalia. II. Aves. III. Reptiles. IV. Pisces. V. Mol- 
lusca. 
B. Insecta. 
I. Arachnides. II. Insecta. III. Crustacea. IV. Annelides. 
V. Cirrhipedes. 
C, Radiata, 
I. Echinodermata. II. Acalephse. III. Zoophyta. IV. En- 
tozoa, Y. Infusoria. 
Since the subkingdoms B and C are constructed according to 
a wholly different type, and betwixt them and the members of 
the true animals, only analogies exist, but no affinities, it suffices 
to define only the classes of the true animals, in order to get 
the means for fixing the station of the single members of each 
class. 
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