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. Class. 



Annelida, Lam. or, Worms with 

 red blood, Cuv. 

 ARTICULATA.. <: II. Crustacea 



III. Arachnida 



IV. 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. 



1. Tubicola 

 Annelida. . ^ 2. Dorsibranchiata 

 Abranchiata 



{I 



ORDER L— 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. 



