ORDER ABRANCHIA. 
31 
Mull. Zool. Dan. lxxv. ; Lumb . sabellaris, ib. civ. 5. M. de 
Lamarck unites them with Nats tubifex, and makes of them 
his genus Tubifex; but a new examination of them is 
necessary. 
Clymena, Sav. 9 
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 seta) ; and a little higher, on the dorsal side, is a 
bundle of finer seta). Their head has neither tentacula nor 
appendages ; their posterior extremity is truncated and radi- 
ated. They also inhabit tubes, Clymena amphistoma , Sav., 
Egg. Annel. pi. i. f. 1 ; Cl. lumbricaUs , Ot., Fabr., Aud. and 
Edw. Littor. de la France, Annel. pi. x. f. 1 — 6 ; CL Ebiensis , 
Aud. and Edw. Littor. de la France, f. 8 — 12. 
The second family, or that of 
Abranchia, without SETiE, comprehends two great 
genera, both aquatic. 
IIirudo, 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 from 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. 
