CLASS VII. 

 RINGED WORMS (ANNULATA^. 



LINNAEUS placed (vid. p. 30) all animals that are destitute of a 

 proper internal skeleton in two classes, that of Insects and that of 

 Worms. In reviewing the principal modifications which subsequent 

 writers have introduced into the general classification of the animal 

 kingdom, we find that they relate chiefly to the animals placed by 

 LlNNJEUS in the latter class. All those classes which we have 

 hitherto treated of have been formed by separation from the Lix- 

 N^EAN class of worms ; all the animals which we shall describe in 

 the sequel as Molluscs formed collectively a portion of the same 

 great division. Amongst creatures so numerous and of such variety 

 of form, there are some which in type, or plan of organisation, 

 approximate towards insects; they are, like insects, articulate 

 animals, but differ from them by the absence of articulate feet. As 

 early as the end of the last century CUVIER made of these a distinct 

 division of the animal kingdom under the name of Worms, and, at 



1 Compare on this class : 



O. F. MUELLER, Vermium terrestrium et Jluviat ilium sen Animalium infworiorum, 

 helminthicorum et testaceorum, non marinorum, succincta Historia, Haunise et Lipsise, 

 1773, 1774, ii Volumina 4to. (This work describes the Worms of LINN.EUS, that is, 

 the invertebrate inarticulate animals and the ringed Worms.) 



0. F. MUELLER, Naturgeschiclite einiger Wurmarten des siissen und salzigen Wassers, 

 mit Kupf., Kopenhagen, 1771, 4to. (new edit. 1800). Descriptions and observations 

 referring chiefly to the genera Na : is, Nereis and Aphrodite. 



J. C. SAVIGNY, Systfrne des Annelides, Description de VEgypte, Tom. xxvi. Paris, 

 1826, (pp. 325472). 



AUDOUIN et MILNE EDWARDS, Classification des Annelides et Description de celles } 

 qui hdbitent les cdtes de la France. Annales des Sc. natur. Tom. xxvii. 1832, pp. 337 

 447, Tom. xxvm. 1833, pp. 187247, xxix. pp. 195269, pp. 388412, xxx. 

 pp. 411425. 



MILNE EDWARDS, Annelida in TODD'S Cydopcedia i. 1835, pp. 164 173. 



A. S. OERSTED, Greenland's Anmdata dorsibranchiata in Kongl. DansTce videnska- 

 bemes Selskabs Naturvidenskdbelige og mathematishe Afhandlinger x. 1813, pp. 153 

 216, with figures. 



A. E. GRUBE, Die Familien der Annelidcn, Ein Systematisches Versuch. Berlin, 

 1851. 



