ANNULATA. 265 



Order Sl'CTOrta (Leeches). 



Body, terminated by a sucker at each extremity, without setse or 

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

 drogynous and ametabolian. 



Genera BrancJiiobdclla, Plscicola, Clepsine, Nephelis, Hoemopis, 

 Scuiguisugn, PontohdeUa. (This aberrant order leads, by the Ne- 

 mertinc worms, to the Turbellaria.) 



Order Terricola (Earthworms, Naiads). 



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

 canal closely attached by numerous bands to the abdominal walls. 

 Androgynous. 



Genera ChcBtogaster, EnchytrcBUS, Nais, Lumhriculus,' Euaxes, 

 Stenuris, Lumbricus, Sternaspis. 



Order Errantia (Nei*eids, Sea-centipedes, Lug-worms, 



and Sea-mice). 



Body-rincjs 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, 

 Clrrntnlas, Ophelia, Peripatus, Glycera, Nephthys, Alciopa, SyUis, 

 P/iyllodoce, IIc»ione, Lycastris, Nereis, Oenone, Aglaura, Lumbri- 

 ncrcis, Eunice, Ainphinome, 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 Serpida, Sabella, Amphiirile, Terebella, Amphicora, 

 Chlorccma. 



* The SabelUna hrachycera, Dujardin (Annates des Sciences Nat. t. xi. 1839, p. 

 291, pi. 7. f. 6.), and the Anisomelcus liitetis, Templcton (Trans. Zool. Soc t. ii. 

 pi. V. figs. 9 — 14.), are probably larvse of Tubicolar anellids. 



