141 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 



, Sav.* 



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

 and obtuse. 



Hffinop. sanguisorba, Sav. ; Hirudo sanguisuga, 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.+ 

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



Bd. nilotica. Eg. AnneL, pi. v,f. 4. Inhabits the Nile. In 

 the 



NEPHELIS, Sav. 



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, Dutroch ||. 



Which only differs from them in an inflation at the spot where the 

 genital organs are placed. 



One species is found in France Geobdella trochetii, Blainv., 

 Diet, des Sc. Nat., Hirud., pi. IV, f. 6, which frequently leaves 

 the water in pursuit of Lumbrici. 



M. Moquin-Tandon, under the name of AULASTOMA, even de- 

 scribes a subgenus, where the mouth is merely furnished with 

 numerous longitudinal plicse Aulast. nigrescent, Moq. Tand., pi. 

 vi, f. 4. 



* This name is changed by M. de Blainville to HYPOBDELLJE. 



f* There is a singular diversity of opinion with respect to the faculty of drawing 

 blood possessed by this animal. Linnams says that nine of them will kill a horse. 

 Messrs. Huzard and Pelletier, 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 vertebrated animal. M. de Blainville thinks 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. 



J M. Moquin-Tandou changes this name to LIMNATIS. 



M. de Bluinville calls them ERPOBDELL^E. Oken had previously named them 

 HICLLUO. Such are : Hir. tulyaris, L., or //. ocfoculufa, Bergm., Stock., Mem., 

 1 757, pi. vi, f. 5 8; N. atotnaria, Careu., L., C, pi. xii. See also pi. vi of Moquin- 

 Tandon. 



|] M. de Blainyille changes this name to GEOBDELLA. 



