ORDER AB RANCH! A. 31 



Mull. Zool. Dan. Ixxv. ; Limib. sabellaris, ib. civ. 5. M. de 

 Lamarck unites them with Nois tuhifex, and makes of them 

 his genus TuBlFEX ; but a new examination of them is 

 necessary. 



, Clymena, Sav., 

 Also appear to belong to this family ; their body, tolerably 

 thick, has but few rings, which for the most part have a range 

 of strong setae ; and a little higher, on the dorsal side, is a 

 bundle of finer setae. Their head has neither tentacula nor 

 appendages ; their posterior extremity is truncated and radi- 

 ated. They also inhabit tubes, Clymena ampliistoma, Sav., 

 Egg. Annel. pi. i. f. 1 ; CI. lumhricalis, Ot., Fabr., Aud. and 

 Edw. Littor. de la France, Annel. pi. x. f. 1 — 6 ; CI. Ebiensis, 

 Aud. and Edw. Littor. de la France, f. 8—12. 



The second family, or that of 



Abranchia, without Setjs, comprehends two gTeat 

 genera, both aquatic. 



HiRUDO, Lin., the leech. 



Have the body oblong, sometimes depressed, and wrinkled 

 transversely. The mouth is surrounded with a lip, and the 

 posterior extremity provided with a flatted disk, both adapted 

 to fix upon bodies by a sort of suction, and serving the leech 

 as the principal organs of locomotion ; for after extending 

 itself, it fixes its anterior extremity, and approximates the 

 other, which in its turn adheres, to allow the first to be carried 

 forward. In several we observe, underneath the body, two 

 series of pores, the orifices of as many little interior pouches, 

 which some naturalists regard as organs of respiration, al- 

 though they are usually filled with a mucous fluid. The intes- 

 tinal canal is straight, inflated fi'om space to space, as far as 

 two-thirds of its length, where there are two coeca. The blood 

 swallowed is preserved there, red and unchanged, for many 

 weeks. 



