W. A. Harding 
183 
Trocheta subviridis, Dutrochet, 1817. 
Plate XV, Figs. 46 and 47. Text Fig. 16 (p. 185). 
Synonymy and Literature: 
Trocheta subviridis, Dutrochet, 1817, p. 130 ; Moquin-Tandon, 1846, p. 309, pi. iv, 
figs. 1—5 (coloured), 6—21 (anatomy); Blanchard, 1892 d (occurrence in Liguria 
and descr.) ; Blanchard, 1893 b, No. 4, figs. 1—8 (fig. 6 is defective) ; Blanchard, 
1893 c, p. 31, figs. 1—4 (annulation, etc.) ; Blanchard, 1894 b, p. 64, figs. 25—30 
(diagrams of annulation, etc.), also p. 52, fig. 14 C, D, E (diagram of somite 
compared! with Herpobdella and Dina ); Diesing, 1850, p. 459; Johnston, 1865, 
p. 45; Gedge, 1869, p. 396. 
Trochetia subviridis, de Blainville (in Lamarck), 1818, p. 292; Milne-Edwards (in 
Lamarck), 1838, p. 523; Bose, 1819, p. 500; Schintz, 1822, p. 826; Cuvier, 1829, 
p. 215; Gray, 1850, p. 52; Gray, 1851, p. 429; Murie, 1865, p. 659; Lee, 1871, 
p. 21; Harting, 1877, p. 515 (occurrences in England, with references). 
Nephelis gigas, Moquin-Tandon, 1826, p. 127, pi. vi, figs. 5 A—D. 
Nephelis trochetia , Moquin-Tandon, 1826, p. 129. 
Hirudo ( Geobdella) trochetii, de Blainville, 1827, p. 246 ; Gervais, 1836, p. 628. 
Erpobdella vulgaris, var. gigas, de Blainville, 1827, p. 564. 
Hirudo ( Geobdella ) viridis, de Blainville, 1827, pp. 244 and 246; de Blainville, 1828, 
p. 559, pi. xxxiv, figs. 6, 6 a, 6 b. 
Geobdella trochetii, de Blainville, 1828, p. 559, pi. xxxiv, fig. 3. 
Trocheta cylindrica, Orley, 1886. 
Nephelis trocheta , Apathy, 1888 a, p. 154 et seq., 1888 b. 
Diagnosis. Body elongate, vermiform, more or less cylindrical 
anteriorly, posteriorly flattened, with keeled margins. Colour grayish 
green or reddish, paler ventrally; generally with two longitudinal, 
paramedian brown lines upon the dorsal surface. 
Somites I—IV and XXVI—XXVII uniannulate, V and XXV bi- 
annulate; the 19 somites VI—XXIV complete and composed generally 
of three large rings followed by five small rings. 
Clitellum more or less swollen and conspicuous, beginning with the 
third large ring of somite X and extending to and including the second 
large ring of somite XIII. 
The male genital orifice is situated between somites XI and XII or 
upon, or immediately anterior to, the last short ring of somite XI. The 
female orifice lies immediately behind, immediately before, or upon, the 
short ring which lies posterior to the intercalated ring of somite XII. 
The eight eyes are disposed in two groups of four each, as in Herpobdella ; 
the anterior group lie in ring 2 and the posterior group in ring 5. Anus 
large and prominent, between the two rings of somite XXV. 
Length, at rest, 80—100 mm.; fully extended, 200—215 mm. 
Width, 7—15 mm. 
12—2 
