ANNULATA. 265 



Order Suctoria (Leeches). 



Bodu, terminated by a sucker at each extremity, without sette or 

 tubular feet. Alimentary canal adherent to the integument. An- 

 drogynous and ametabolian. 



Genera Branchiobdella, Piscicola, Clepsiiie, JVephelis, Hoemopis, 

 Sanguisuga^ Pontobdella. (This aberrant order leads, by the Ne- 

 mertine worms, to the Turhellaria.) 



Order Terricola (Earthworms, Naiads). 



Body, long, cylindrical, the rings provided with setre. Alimentary 

 canal closely attached by numerous bands to the abdominal walls. 

 Androgynous. 



Genera Chcetogaster, Enchytrceus, Nais, Lumhriculus^ Eiiaxes, 

 Scemiris, Lumbricus, Sternaspis. 



Order Eerantia (Nereids, Sea-centipedes, Lug-worms, 

 and Sea-mice). 



Body-rings with tubular setigerous feet ; external gills on the 

 greater number. Alimentary canal loosely attached to the ab- 

 dominal walls. Dioecious. Metabolian. 



Genera Arenicola, Ammotrypane. Chcetopterus, Aricia, Aricinella^ 

 Cirratulus, Ophelia^ Peripatus, Glycera, Nephthys, Alciopa, Syllis, 

 P/iyl/odoce, Hesioiie, Lycastris, Nereis, Oenone, Aglaura, Lumbri- 

 jiereis, Eunice, Amphinome, Sigalion, Polynoe, Aphrodite. 



Order Tubicola (Animal-flowers). 



Body-rings with tubular setigerous feet ; gills attached to or near 

 the head. Alimentary canal loosely connected with the abdominal 

 walls. Dioecious. Metabolian.* Inhabiting natural or artificial 

 tubes. 



Genera Serpula, Sabella, Amphilriie, Terebella, Amphicora, 

 ChlorcEma. 



* The SabeUina brachjcera, Dujardin (Annates des Sciences Nat. t. xi. 1839, p. 

 291, pi. 7. f. 6.), and the Anisomeleus liiteus, Templeton (Trans. Zool. Soc. t. ii. 

 pi. V. figs. 9 — 14.), are probably larvae of Tubicolar aneUids. 



