148 
The British Leeches 
That P. tessellata occurs in England is proved by the discovery 
of the example which forms the subject of the accompanying description 
and figures, and this fact substantiates the opinion expressed by Livanow 
and shared by the present writer, that Brightwell (Nephelis tessellata, 
1842), Thompson (Glossiphonia eacheana, 1856) and Houghton ((?. 
tessellata, 1865) all had this form, and not P. meyeri, before them. 
Protoclepsis tessellata, 0. F. Muller, 1774. 
Plate XV, Figs. 33—35. Text Fig. 4 (p. 147). 
Synonymy and Literature: 
Hirudo tessulata, 0. F. Muller, 1774, p. 45 ; 0. F. Muller, 1776, p. 220 ; Gmelin, 1788, 
p. 3098; Schrank, 1803, p. 161; Braun, 1805, p. 56, pi. vi, figs. 6—10 (coloured); 
Turton, 1806, p. 70; Johnson, 1816, p. 33 ; Fleming, 1824, p. 400. 
Hirudo tessellata, Bose, 1802, p. 247 ; de Blainville, 1827, p. 261 ; Dalyell, 1853, p. 38, 
pi. iv, figs. 24—30 (coloured). 
Erpobdella tessulata, Fleming, 1822, p. 604 ; Thompson, 1844, p. 437 (in Ireland); 
Johnston, 1846, p. 440. 
Ichthyobdella tessellata, de Blainville, 1828, p. 558. 
Erpobdella vulgaris, var. tessellata , de Blainville, 1828, p. 564. 
Nephelis tesselata, Savigny, 1822; Brightwell, 1842, p. 13, pi. i, figs. 15—17 
(coloured). 
Clepsine tessulata, Fr. Muller, 1844 a, p. 376 ; Fr. Muller, 1844 b, p. 21 ; Fr. Muller, 
1846, p. 138, pi. viii, figs. 1—4 and 7—13 (anatomy of genital organs); Diesing, 
1850, p. 447 ; Diesing, 1858, p. 495 ; Grube, 1851, p. 114 ; Malm, 1860, p. 81 ; 
Orley, 1886, p. 100 ; Apathy, 1888 a, p. 154 et seq., pi. viii, fig. 14 (head); Apathy, 
1888 b, p. 789 etseq.; Spoof, 1889, p. 16 ; Brandes, 1900, p. 126 (copulation). 
Glossiphonia tessellata, Moquin-Tandon, 1846, p. 379 ; Thompson, 1846, p. 390 (in 
Ireland); Johnston, 1865, p. 50 ; Houghton, 1865, p. 88 et seq. ; R. Blanchard, 
1892 f, p. 56 (description); R. Blanchard, 1892 g, p. 117 (in Chile); de Guerne, 
1892, p. 360 (on waterfowl); R. Blanchard, 1893 b, p. 23 (in Piedmont); R. 
Blanchard, 1893 h, p. 197 ; R. Blanchard, 1893 i, p. 2 (in Syria) ; Megnin, 1905, 
p. 71 (on waterfowl). 
Hirudo vitrina—the Glassy Leech, Dalyell, 1853, p. 42, pi. v, figs. 20—23 (coloured); 
Johnston, 1865, p. 53. 
Glossiphonia eacheana , Thompson, 1846, p. 390 ; Thompson, 1856, p. 425 ; Johnston, 
1865, p. 54. 
Haemocharis eacheana, Thompson, 1856 b, p. 425. 
Hemiclepsis tessellata, Vejdovsky, 1883; R. Blanchard, 1894 b, p. 32; Bayer, 1898, 
p. 648 et seq. (sense organs); Scharff, 1898, p. 192 (in Ireland). 
Clepsine tesselata, Weltner, 1887, p. 85 ; Collin, 1892, p. 164 (from Cygnus atratus). 
Diagnosis. Body flattened and very soft; in extension ovate-oblong, 
with nearly parallel sides and the head region slightly dilated; in 
extreme contraction ovoid, the length being equal to about twice the 
