DIVISION III.— ARTICULATA. 
In this grand division, the body, and in general the limbs, are 
surrounded by, or encased in, articulated rings, affording a support 
for the soft parts, and an attachment for the muscles. 
It is divided into four classes. 
Division. 
ARTICULATA. . 
Class. ' 
Annelida, Lam. or, Worms with 
red blood, Cuv. 
Crustacea 
Arachnida 
Insecta 
CLASS I.— ANNELIDA, or, Worms with red blood. 
Body soft, elongated, articulated or divided into segments or 
transverse folds. 
The Annelida are divided into three orders, viz 
Class. Order. 
f 1. Tubicola 
Annelida. . < 2. Dorsibranchiata 
^3. Abranchiata 
ORDER I. — Tubicola. 
These animals form tubes to live in, either of calcareous matter 
exuded from their own body, or from foreign substances, to which 
tubes they are not however attached, like the tubicolous or testa- 
ceous mollusca. 
