152 THE ANNELIDES. ^ 142. 



■Genera: Tetrastemma, Polyslemma, Micrura, Notospermus, Meckelia, 

 Polia, JSemertes, Borlas'ia. 



SUB-ORDER II. HIRUDINEI. 

 Posterior extremity of body provided with a sucker. 



Oenera : Branchiobdella, Pisckola, Clepsine, Nephelis, Haemopis, Aulaco* 

 stornum, Sanguisuga, Pontobdella. 



ORDER IL CHAETOPODES. 

 Body provided with bristles. 



SUB-ORDER in. LUMBRICINI (ABRANCHIÄTI.) 

 Body without feet, 



denera: Ckaetogaster, Enchyfraeus, Na>'s, Liimhricvlus, Euaxes, SaenU' 

 ris, Lmnbricus, Sternaspis. 



SUB-ORDER IV. CAPITIBRANCHIATI. 



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

 tremity. 



denera : Siphonostomum, Chloraema, Amphicora, Serpida, Sahella, Am- 

 phitrite, Terebella. 



SUB-ORDER V. DORSIBRANCHIATI. 

 Body provided with feet ; branchiae situated upon its segments. 



Oenera : Are?iicola, Ammotrypane, Chaetopterus, Aricia, Aricinella, Cir' 

 ratulus, Peripatus, Glycera, Go?iiada, Nephtys, Alciopa, Syllis, Phyllo- 

 doce, Hesione, Lycastis, Ne?-eis, Oenone, Aglaura, Lumbrinereis, Eu?iice, 

 Amphiname, SigaUoii, Polyno'c, Aphrodite. 



BIBLIOGRAPHY. 



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



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

 Kopenhagen, 1771. 



Savigny. Description de l'Egvpte. Histoire Naturelle. Tom. XXI. 

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



Moquhi'Tandon. Monographie de la famille des Hirudinees. Paris, 

 1827. 



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

 Bruxelles, 1829. 



