W. A. Harding 
165 
This family, which includes the typical ten-eyed blood-sucking 
leeches, has been divided by Blanchard (1896 a, p. 9) into the following 
sub-families:—(1) The Haemadipsinae, comprising the blood-sucking 
land-leeches; (2) the Hirudininae, discussed below and (3) the Semi- 
scolecinae, a small group of amphibious forms without jaws, possessing 
distinct affinities with the Herpobdellidae. With the exception of 
one species of Haemadipsinae, the curious Xerobdella lecomtei (von 
Frauenfeld, 1868), found in the Austrian Alps, the first and third of 
these sub-families are not represented in Europe. 
Sub-family. HIRUDININAE. 
With five pairs of eyes and with denticulate jaws. Complete somite 
formed of five rings. The nephridial pores open near the margins of the 
body upon the ventral surface. 
Blanchard (1896 b) divides this group into two series based upon 
characters exhibited by the teeth and jaws. 
Series 1. Distichodonta. 
Jaws without papillae and armed with two rows of infrequent, blunt, 
irregular teeth. 
Genus: Haemopis, Savigny, 1822. 
Synonymy: 
Aviastoma, Moquin-Tandon, 1826. Hirudo ( Pseudohdella ), de Blainville, 1827. 
Hirudo ( Hippobdella ), de Blainville, 1827. Pseudohdella, de Blainville, 1828. 
Aulacostomum, Grube, 1850. Aulostomum, Polonio, 1860. 
Crop with one pair of elongate, lateral caeca reflected posteriorly. 
Genital openings usually separated by Jive rings. Upper lip of anterior 
sucker not divided inferiorly by a longitudinal groove. 
Haemopis sanguisuga, Linnaeus, 1758. 
Plate XV, Figs. 39—41. Text Figs. 11 and 12 (pp. 167 and 170). 
Synonymy and Literature: 
Rossaglen, Aldrovandus, 1602, p. 722. 
Horseleech , Mouffet, 1634, p. 323, woodcut. 
Hirudmes venenatae, Horse-Leeches , Sibbald, 1683, p. 34. 
Hirudo rnaxime apud nos vulgaris—the Horse-Leech or Bloodsucker , Ray, 1710, 
p. 3. 
Parasitology in 
11 
