TABLE SHOWING THE CLASSIFICATION OF THE ARTHROPODS 
DESCRIBED IN THIS CHAPTER 
Phylum 
ARTHROPODA 
Class 
CRUSTACEA 
Subclass 
Entomostraca 
(Crustacea of small, often of almost microscopic minuteness, and of comparatively 
simple organization; appendages have little differentiation) 
Order PHYLLOPODA 
(Appendages resemble leaves; mostly fresh-water species) 
Suborders Genera 
EUPHYLLOPODA 
(Phyllopoda of considerable 
size, bearing ten to sixty 
pairs of leaf-like swim- 
ming-feet) 
CLADOCERA 
(Small phyllopoda; body 
laterally compressed ; cara- 
pace like a bivalve shell; 
Sour to five pairs of swim- Daphnia 
ming-feet ; chief organs of Leptodora 
locomotion are the bdira- - 
mous antenne; abdomen Moina 
devoid of appendages. They Polyphemus 
abound in fresh water, are 
very prolific, and afford a 
large amount of food to 
Sresh-water fishes) 
Order OSTRACODA 
(Resemble minute bivalve shells ; swim by antenne ; body unsegmented ; 
appendages seven pairs only) 
Cypris (fresh-water) 
Cypridina (marine) 
238 
