144 ANNELIDES. 



blood. It is usually blackish, with yellowish streaks above, 

 and yellowish with black spots beneath. It is found in all stag- 

 nant waters. The 



H^MOPsis, Sav.* 

 Differs from the preceding in the teeth of its jaws, which are few 

 and obtuse. 



Hcpmop. sanguisorba, Sav. ; Hirudo sanguisiiga, L., Moq. 

 Tand., pi. iv, f. 1 ; Car., pi. xi, f. 7 (The Horse Leach). Much 

 larger, and entirely greenish-black. It is said to cause danger- 

 ous wounds f . In the 



Bdella, Sav-X 



There are but eight eyes, and the jaws are completely edentated. 



Bd.nilotica, Eg. Anne\.,\A.v,{. "i. Inhabits the Nile. In 

 the 



Nephelis, S«l'.§ 



There are also but eight eyes ; the interior of the mouth has but 

 three folds of skin. Several small species are found in the stagnant 

 waters of France; it is thought proper to distinguish from them the 



Trochetia, Dntroch \\. 



"\^''hich only differs from them in an inflation at the spot where tlie 

 genital organs are placed. 



One species is found in France — Geohdella trochetii, Blainv., 

 Diet, des So. Nat., Hirud., pi. IV, f. 6, wliich frequently leaves 

 the water in pursuit of Lumbrici. 



M. Moquin-Tandon, imder the name, of Aulastoma, even de- 

 scribes a subgenus, where the mouth is merely furnished with 

 nimieruus longitudinal plicae — AuIaH. nigrescens, Moq. Tand., pi. 

 vi, f. 4. 



* This name is changed by M. de Blaiuville to IIypobdell-E. 



-(- There is a singular diversity of oiiinion with respect to the faculty of drawing 

 blooJ possessed by this animal. LiuuKUS says that nine of them will kill a korse. 

 Messrs. HuzarJ and Pelietier, on the contrary, in a Memoir, ad hoc, presented to 

 the Institute, and inserted in the Journal de Pharmacie, March 1825, assert that 

 it attacks no vcrlehrated animal. M. dc Blainville tl'.iuks this is owing to its having 

 been confounded with a neighbouring species, the Sangsue noire, which he makes 

 the type of a genus called Pseudobdella, the jaws of which are mere folds of skin 

 without, any teeth. I think this fact worthy of examination. Both species devour 

 the Lumbrici with avidity, 



X M. Moquin-Tandon changes this name to Limnatis. 



§ M. de Blainville calls them EarOBDKLLiE. Oken had previously named them 

 Helluo. Such are : Hir. vulgaris, L., or //. ocfocuhita, Bergm., Stotk., Mem., 

 1 757, pi. vi, f. — 8 ; — .V. atomaria, Caren., L., C, pi. xii. See also pi. vi of Moquin- 

 Tandon. 



II M, de Blainville chanees this name to Geobdella, 



