BECENT WOEKS 0?f THE ENTOZOA. 



833 



ANNUL08A ANARTHROPODA. 



PROVINCE— ANNIJLATA. 



CLASS I. 

 Annelida. 

 (Ciivier.) 



CLASS IL 



EOTIFERA. 



(Cuvier.) 



CLASS III. 



SCOLECIDA. 



(Busk.) 



Orders. 

 ^ 1. Oestelmintha, Gegenbaur.J 

 Monaecia. ) 2- S:irudinea, Savigny, Vogt. 



I 3. Malacopoda, De Blainville.f 

 t.4. Oligochcdta, Grube. 



DiSBCia * 1^* ^^i'^^^^j ^^ Quatrefages. 



^ * (6. Folychata, Grube. 



PEOYINCE— ANNULOIDA. 



Orders. 



1. Natantia, Yogt. 



2. Sessilia, Yogt. 



Orders. 



f Platyelmia. 

 I (Vogt.) 



Nematelmia 



^ (Yogt.) 



rl. TurleUaria, Ehrenberg. 

 < 2. Trematoda, Eudolphi. 



3. Cestoidea, Eudolphi. 





Acanthoeepliala, Eudolplii. 

 Gordiaceaj Siebold. 

 JSFematoidea^ Eudolplii. § 



CLASS lY 



ECHIJS ODEEMATA. 



(Klein, ext.) 



PEOYINCE— ECHINODEEMATA. 



Orders. 

 {not given.) 



* The disecious Annelids have ciliated larvse, which undergo a metamorphosis. 

 The embiyo of the moncecious forms is never ciliated, and, on leaving the egg, more 

 or less closely resembles the parent. 



X Suggested by Gegenbaur as the name of a 'class' for the genus Sagitfa, 

 which he considers should be placed between the Nematoidea and Annelida. We 

 follow Krohn in regarding this perplexing fonu as an ahQYrSkUi Annelid. 



t Containing only the genus Pe7'^>rt;^fw5, which Guilding, its discoverer, regarded 

 as a MoUusk; Gervais, as aMyriapod; Audouin and Milne Edwards, as representing 

 a family among the Annelida Errantia. Grube established for its reception a 

 separate order {Onychophora) but aftenvards thought it more nearly allied to the 

 Leeches. A like view is held by Van Beneden. De Blainville, followed by 

 Blanchard, raised Peripatus to the rank of a class. The first opinion of Grube 

 seems to us that nearest the truth, but De BlainAalle's name has the priority. 

 Mihie Edwards, in his Lectures, has arranged Peripatus among the Plewoneura. 



§ It will be seen that the above arrangement returns into itself in so far as the 



