48 HIRUDINID^. 



La Sangsue de cheval, Blainv. Diet, des Sc. nat. xlvii. 252. Milne- 

 Edwards, Elem. Zool. ii. 22/. 



Hippobdella sanguisuga, Blainv. Diet, des Se. nat. Ivii. 561. 



Hippobdella sanguisorba, Blainv. Diet. Atlas Hirud. f. 2. Egidy, 

 Bluteg. 13-1. f. 67- 



Hsemopis sanguisuga, Moq.-Tandon, Monogr. 318. 



/3. fusca, body almost cylindrical, the back of a very deep brown, 



unhanded ; the margins of the same colour. 



Hirudo fusca, Blainv. Diet, des Sc. nat. xlvii. 273. Moquin-Tandon, 

 Monogr. 348, 



Hab. Lakes and ponds. 



Obs. The variety is a disputable worm, Blainville inquires if it 

 may not be the Trocheta subviridis. Derheims says that it is found 

 in the north of Scotland, and is rather terrestrial than aquatic in its 

 habits. 



8, HIRUDO. 



Hirudo, Linn. Syst. x. 649, Moquin-Tandon, Monogr. 326. Dies. 



Syst. Helm. i. 465. 

 Sanguisuga, Savig. Syst. Annel. 113. Lam. Anim. s. Vert. 2de edit. 



V. 520; Encyclop. Brit. xi. 225. 

 latrobdella, Blainville in Diet, des Se. nat. xlvii. 253 & Ivii. 561. 



Char. Body elongate, insensibly widening backwards, plano-con- 

 vex, composed of numerous narrow equal very distinct segments, 

 margined : acephalous ; the oral sucker with an entire thick plaited 

 rim, the upper lip prominent, obtusely lanceolate : mouth large, 

 with three equal compressed jaws, multidenticulate on the cutting 

 edge: eyes 10, on a curved line; six on the first segment, two on 

 the third, and two on the sixth, remote from the others : anal sucker 

 rather small, with a ventral aspect, radiatingly plaited : vent minute, 

 round. Encloses the ova in a free spongy cocoon. 



1 . H. medicinalis, greenish-olive or very dark green or brown, with 

 six interrupted yellowish fascise along the back, sometimes obsolete ; 

 the marginal band straight. Length 4-7" ; breadth &". 



Hirudo major, Gesner, Hist. Pise. ^ Aquatil. 503, cum fig. 



Hirudo, Aldrov. de Insect, lib. 7. 722, and the fig. p. 765. Willis in 



Act. Hafn. iii. 120, cum fig. rud. 

 La Sangsue, Rondel. Poiss. ii. 169. 

 Hirudo alia parvis tuberculis nonnihil aspera medicinalis, Raii Hist. 



Insect. 3. 

 Hirudines innoxise vulgares, Sib. Scot. Illustr. ii. 3. 34. 

 Hirudo depressa nigra abdomine subcinereo, Linn. Faun. Suee. 365. 

 The Common Leech, Hill, Hist. Anim. iii. 16. pi. 2. 

 The Leech, Swammerd. Bib. Nat. i. 28. Rep. Ray Soe. Zool. 1847 



511. 



