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, Annelides, Crustacea, 

 Arachnides, Myriapoda, and Insecta. 



CLASS v.— ANNELIDES. 



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

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

 blood. It contains three orders. 



ORDER I.— SEDENTARI^. 



Animals protected by a testaceous tube, which they never 

 leave during life ; branchiae placed at one extremity of the body. 



TRIBE I. SERPULACEA. 



The branchiae are either separate, or covered by an operculum ; 

 tube solid and testaceous. 



Genus 1 — MA GIL US — Lamarck. 

 Generic Character. — Shell with its base bent into a spiral 



