ANNULATA. 265 



Order Scctoria (Leeches). 



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

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

 drogynous and ametabolian. 



Genera Branchiobdella, Piscicola, Clepsine, JVephelis, Hoemopis, 

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

 mertine worms, to the Turbellaria.) 



Order Terricola (Earthworms, Naiads). 



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

 canal closely attached by numerous bands to the abdominal walls. 

 Androgynous. 



Genera Chcetogaster, EnchytrcBus, Nais, Lumbriculus^ EuaxeSy 

 StBnuris, Lumbricus, Sternaspis. 



Order Errantia (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, Peripatiis, Glycera, Nephthys, Alciopa, Syllis, 

 Phyllodoce, Hesione, Lycastris, Nereis, Oenone, Aglaura, Lumbri- 

 nereis, Eicnice, Amphinome, Sigalioji, Polyno'e, 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 SerpulUy Sabella, Amphitrite, Terebella, Amphicoray 

 Chlorcema. 



* The Sabellina brachycera, Dujardin(Annalesdes Sciences Nat. t. xi. 1839, p. 

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

 pi. Y. figs. 9 — 14.), are probably larvae of Tubicolar anellids. 



