AKACHNIDES. 
SECTION IV. 
455 
THIS order, according to Lamarck, and other modern 
zoology contains the spiders, scorpions, caterpillars, 
3ite8, and other insects without wings, and which do not 
undergo any metamorphoses. These creatures differ 
from the true insects in the number of their feet, which 
are genera ly eight and frequently very numerous while 
those of the true insects never exceed six. They a]so 
differ in their manner of breathing; the spiders and scor- 
pions being furnished with air-sacks, or bags, which act 
Ike lungs; while the other animals belonging to the 
class have trachea, or air-passages, like the true in- 
sects. 
SPIDERS. (Aranidea.) 
the Spiders are distinguished by having no antenna ; 
