W. A. Harding 
151 
De Guerne (1892) has collected interesting evidence showing that 
migrating ducks can become active agents in the distribution of living 
leeches attached to their bodies. Leeches obtained by him from the 
breast plumage of a wigeon (Mareca penelope L.) and a teal ( Querquedula 
crecca L.) were described by Blanchard (1893, p. 62) as P. tessellata, 
though Livanow would have us believe that they were specimens of 
P. meyeri. 
Blanchard (1893 h, p. 197) describes two undoubted examples of 
P. tessellata, taken from the nasal cavities of Anas glacialis. 
Finally Megnin (1905, p. 71) instances the case of a domestic duck 
choked by an accumulation of leeches, also referred by Blanchard to 
P. tessellata, which had penetrated into the air passages and completely 
blocked the trachea. 
Genus: Hemiclepsis, Vejdovsky, 1883. 
Synonymy: 
Haemocharis, de Filippi, 1837 (partim ; not Haemocharis, Savigny, 1822). Glossi- 
phonia , Johnson, 1816 (partim). Clepsine , Savigny, 1822 (partim). Hemiclepsis, 
Vejdovsky, 1883 (partim). 
Glossosiphonidae of medium size, with two pairs of eyes. Complete 
somite formed of three rings. The 21 somites III—XXIII are complete. 
Head region dilated into a permanent anterior sucker distinct from the 
body. Crop with more than six pairs of many-lobed lateral caeca, the 
last and longest pair reflected posteriorly. 
This genus has recently been revised by Livanow (1902) who has 
separated from it the genus Protoclepsis ( q.v.). 
Hemiclepsis marginata, 0. F. Muller, 1774. 
Plate XIV, Figs. 28—32. Text Figs. 5 and 6 (p. 153). 
Synonymy and Literature : 
Hirudo marginata , 0. F. Muller, 1774, p. 46 ; 0. F. Muller, 1776, p. 200 ; Gmelin, 
1788, p. 3098; Bose, 1802, p. 257 ; Schrank, 1803, p. 162 ; Turton, 1806, p. 70 ; 
Johnson, 1816, p. 36 ; Baer, 1827, p. 728, pi. xxxii, fig. 10. 
Hirudo variegata, Braun, 1805, p. 61, pi. vii, figs. 1—6 (coloured). 
Hirudo cephalota, Carena, 1820, p. 298, pi. xii, figs. 19, 20 ; Carena, 1823, p. 336 ; 
de Blainville, 1827, p. 266, pi. xxvii, figs. 5, 5 a (named in plate Ichthyobdella 
cephalota'). 
Hirudo oscillatoria, Saint Amans, 1825, p. 193, pi. viii. 
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