ANNULATED ANIMALS. 
In this type the nervous system consists of a 
series of ganglia connected by two longitudinal 
nervous cords. 
CLASS I. CRUSTACEZ, 
All the animals of this class are covered by 
integuments of a more earthy character than any 
others of the type Annulata,—they were arranged 
by Linneus amongst the apterous insects and are 
included in his. genera Cancer, Monoculus and 
Oniscus,—Lamarck first established them as a 
distiuct class; in all of them, as far as has hitherto 
been explored, the sexes are distinct. 
A. ENTOMOSTRACA. 
Mandibles simple or none—Legs branchial. 
APUS. Propvuctus. (Latr.) In stagnant ponds, 
DAPHNIA. Puxex. (Latr.) Ditto. 
CYPRIS. Concnacea. (Latr.) Donovan, 1. 
t. 5. (Monocuxus ConcnHaceus.) In clear 
ponds, swim with great rapidity and whilst 
Swimming conceal the whole body in the bivalve 
shell, 
