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 
HaiMOPSis, Sav.* * * § 
Differs from the preceding in the teeth of its jaws, which are few 
and obtuse. 
Hcpmop. sanguisorha, Sav. ; Hirudo sangui^uga, 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, .Sau.;j; 
There arc but eight eyes, and the jaws are completely edentated. 
Bd. nilotica, 
the 
Eg. Annel., pi. v,f. 4. 
Nephelis, 
Sav. ' 
Inhabits the Nile. In 
There arc 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 1|. 
Mdiich only differs from them in an inflation at the spot where the 
genital organs are placed. 
One species is found in France — Geohdella trochefii, 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 Aptlastoma, even de- 
scribes a subgenus, where the mouth is merely furnished with 
numerous longitudinal plicae — Aula'll, nigrescens, Moq. Tand., pi. 
vi, f. 4. 
* This name is changed by M. de Blainville to Hypobdei.l.e. 
-f' There is a singular diversity of opinion with respect to the faculty of drawing 
blood possessed by this animal. Linuseus says that nine of them will kill a horse. 
Messrs. Huzard and Pelletier, on the contrary, in a Memoir, ud hoc, presented to 
the Institute, and inserted in the Journal de Pharmacie, March 1825, assert that 
it attacks no vertebrated animal. INI. de Blainville thinks this is ow'ing to its having 
been confounded with a neighbouring species, the Simgsuc noire, which he makes 
the type of a genus called Pseudobdella, the jaws of which are mere folds of skin 
w'ithout any teeth. I think this fact worthy of examination. Both species devour 
the Lumbrici with avidity. 
M. Moquin-Tandon changes this name to Limxatis. 
§ M. de Blainville calls them Erpobdelb.e. Oken had previously named them 
Helluo. Such aie : Hir. vulyaris, L., or II. ocfuculuta, Bergm., Stock., Mem., 
1757, pi. vi, f. 5 — 8 ; — N. atomariu, Caren., L., C, pi. xii. See also pi. vi of Moquin- 
Tandon. • 
11 M. de Blainville changes this name to Geobdella. 
