DIVISION III. 

 ARTICULATA 



The animals of this comprehensive division, have their 

 bodies, or members, composed of segments or articulated 

 rings, to which the muscles are attached, on their interior 

 surface. This division contains five classes, namely, Annn- 

 losa, Crustacea, Arachnidce, Myriapoda, and Insecta. It is 

 in the first only that testaceous bodies, like those usually 

 called shells, occur. 



CLASS V.-ANNULOSA. 



Bodies more or less elongated, soft, naked, or enclosed in 

 a tube, consisting of a number of segments, and having red 

 blood. It contains three orders. 



OEDEE L-SEDENTAEIA. 



Animals protected by a testaceous tube, from which they 

 never issue entirely ; branchiae placed at one extremity of 

 the body, or near it. 



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