162 THE ANNELIDES. ^ 142. 



Genera: Tetrastemma, Polystemma, Micntra, Notospermus, Meckelia, 

 Polia, Nemertes, Borlasia. 



SUB-ORDER II. HIRUDINEI. 

 Posterior extremity of body provided with a sucker. 



Genera: BraJichiobdella, Piscicola, Clepsine, Nephelis, Hae7nopis, Aulaco- 

 stomuon., Sanguisuga, Poiitohdella. 



ORDER II. CHAETOPODES. 



Body provided with bristles. 



SUB-ORDER in. LUMBRICim (ABRANCHIATI.) 



Body without feet. 



Genera : Ckaetogaster, Enchytraeus, Na'is, Luvibriculus, Euaxes, Saemi- 

 ris, Lumbricus, Ster?iaspis. 



SUB-ORDER IV. CAPITIBRANCHIATI. 



Body provided with feet; branchiae situated upon the cephalic ex- 

 tremity. 



Genera : Siphonostomum, Ckloraema, Amphicora, Serpula, Sabella, Am- 

 phitrite, Terebella. 



SUB-ORDER V. DORSIBRANCHIATI. 

 Body provided with feet ; branchiae situated upon its segments. 



Genera : Are?iicola, Ammotrypane, Chaet.opterus, Aricia, Aricinella, Cir- 

 ratulus, Peripatus, Glycera, Go7iiada, Nephtys, Alciopa, Sylli's, Phyllo- 

 doce, Hesione, Lycastis, Nereis, Oejione, Aglaicra, Luinbrinere'is, Eunice, 

 Amphinome, Sigalion, Polyno't, Aphrodite. 



BIBLIOGRAPHY, 



Pallas. Miscellanea zoologica. Hague, 1766, p. 72. 



O. F. Midler. Von den Wurmen des siissen und salzigen Wassers. 

 Copenhagen, 1771. 



Savigny. Description de I'Egypte. Histoire Naturelle. Tom. XXI. 

 1826. Annelidcs. Also, Isis, 1832, p. 937. 



Moquin-TauduiL. Monographic de la famille des Hirudinees. Paris, 

 1827. 



Morren. De lumbrici terrestris historia naturali, nee non Anatomia. 

 Bruxelles, 1829. 



