152 THE ANNELIDES. "§. 142. 



Genera : Tetrastemma, Pohjstemma, Micr?/ra, Notospermus, Meckelia, 



Folia, Neviertes, Borlasia. 



SUB-ORDER II. IIIRUDINEI. 

 Posterior extremity of body provided with a sucker. 



Genera : BraJichiobdella, riscicola, Clepsine, Nepkelis, Hae?nopis, Aulaco- 

 storaum, Sanguisuga, Fontohdella. 



ORDER 11. CHAETOPODES. 

 Body provided with bristles. 



SUB-ORDER III. LUMBRICim (ABRANCHIATI.) 

 Body without feet. 



Genera : Chaetogaster, Enchytraeus, Nais, Lnmhriculus, Euaxes, Saemi- 



ris, Lumbricus, Sternaspis. 



SUB-ORDER IV. CAPITIBRANCHIATI. 



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

 tremity. 



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



phitrite, Terebella. 



SUB-ORDER V. DORSIBRANCHIATI. 

 Body provided with feet ; branchiae situated upon its segments. 



Genera : Arenicola, Ammotrypane, Chaetopterus, Aricia, Aricinella, Cir- 

 ratulus, Peripatus, Glycera, Goniada, Nephtys, Alciopa, Syllis, Phyllo- 

 doce, Hesione, Lycastis, Nereis, Oenone, Aglaura, Lumbrinereis, Eunice, 

 Amphinome, Sigalion, Polyno'e, Aphrodite. 



BIBLIOGRAPHY. 



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



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

 Copenhagen, 1771. 



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

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



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

 1827. 



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

 Bruxelles, 1829. 



