THE FRESHWATER MOLLUSCA OF VICTORIA 
107 
gunni Frauen., from which it may be distinguished by its 
smaller size and more turbinate form. 
Type in the National Museum, Melbourne. Reg. No. 71209. 
Family LIMNAEIDAE. 
Genus LIMNAEA Lamarck, 1799. 
Limnaea lessoni Deshayes. 
(PI. I, Fig. 6.) 
1830 Limnea lessoni Desh., Magasin de Zool., p. 16, figs. 1, 2. 
1830 Lymnaea lessonii Desh. Lesson, Voy. Coquille, Zool., p. 330, pi. 15, 
fig. 1. 
1830 Lymnaea lessonii Desh. Lesson, Centurie Zoologique, p. 120, pi. 
44 (shell and animal). 
1850 Lymnea perlevis Conrad, Pr. Acad. Nat. Sci. Phil., v, p. 11. 
1854 Amphipeplea strange! Pfiffer, Malak. Blatt., p. 64. 
1854 Id., Novit. Conch., p. 6, pi. 2, figs. 5, 6. 
1854 Amphipeplea melbournensis Pfeiffer, op. cit., p. 70, pi. 19, figs. 
14, 15. 
1859 Limnaea (Neristoma) lessoni, Desh. Chenu. Man. de Conch., i, 
p. 480, fig. 3542. 
1862 Limnea lessoni Desh. Kuster, Conch. Cab., pi. 5, figs. 16, 17. 
1866 Amphipeplea perlevis Conrad, Am. Journ. Conch., ii, p. pi. 1, 
fig. 5. 
1873 Limnaea melbournensis Pfr. Reeve, Conch. Icon., xviii, pi. 6, fig. 39. 
1873 L. strange! Pfr. Sowerby, Conch. Icon., xviii, pi. 6, fig. 40. 
1873 L. globosa Sby. Reeve, Conch. Icon., xviii, pi. 12, fig. 84. 
1882 Lymnaea Lessoni Desh. Tate and Brazier, Pr. Linn. Soc. N.S.W., 
vi, p. 554. 
1882 Limnaea (Amphipeplea?) Lessoni Desh. Smith, Journ. Linn. Soc. 
Lond., Zool., xvi, p. 271. 
1882 L. melbournensis Pfr. Tate, Tr. Roy. Soc. S. Aust., iv, p. 76. 
1894 L. lessoni Desh. Whan, Geelong. Nat., iv, No. 10, p. 9. 
1896 Id. Fielder, Viet. Nat., xii, No. 11, p. 140. 
1917 Id. Cherry, “Bilharziosis,” p. 4, fig. 11. 
1932 Id. Cotton and Godfrey, S. Aust. Nat., xiii, p. 158, pi. 2, fig. 3. 
Size. — Length, 24 mm. ; breadth, 18 mm. 
Localities, — Melbourne (Nat. Mus. Melb.) ; South Brighton 
(W. Kershaw) ; Lake Koollamuth (Rev. Whan) ; Heidelberg 
(Rev. W. Fielder) ; Malvern (Rev. G. Cox) ; Sale (T. Wor- 
cester) ; Bannerton (A. C. Nilson) ; Shelford, Avoca (J. H. 
Young) ; Lake Hattah (J. E. Dixon). 
Vernacular Name. — Lesson’s Pond-Snail. 
Observations. — A thin, globose, pale horn-coloured shell, 
the largest of the genus in Victoria ; variable in shape, many 
examples having somewhat flattened sides, a feature in 
Conrad’s L. perlevis. It is abundant and widely distributed 
throughout Victoria. 
