102 
THE FRESHWATER MOLLUSCA OF VICTORIA 
account in the South Australian Naturalist, 1934, No. 4, 
p. 113, of a fine specimen of HyrideUa australis found 
attached to the foot of a Black Duck, Anas superciliosa, shot 
on the wing near Narracoorte, South Australia. 
Pearls are occasionally found in our freshwater mussels. 
The types of the two new species herein described and also 
all specimens illustrated are now in the National Museum 
of Victoria, with the exception of those shown in figs. 9, 16, 
19 and 20. 
I am indebted to Mr. C. W. Brazenor of the National 
Museum for the excellent photographs used to illustrate this 
paper. 
GASTEOPODA. 
Family MELANIIDAE. 
Genus MELANIA Lamarck, 1799. 
Melania balonnensis Conrad. 
(PI. I, Fig. 1.) 
1843 Melania lirata Menke (non Benson), Moll. Nov. Holl, p. 9. 
1850 M. balonnensis Conrad, Pr. Acad. Nat. Sci. Phil., v, p. 11. 
1850 M. tetrica Conrad, op. cit. 
1866 Id., Conrad, Am. Journ. Conch., ii, p. 80, pi. 1, fig. 9. 
1866 M. balonnensis Conrad, op. cit., ii, p. 80, pi. 1, fig. 10. 
1874 Id., Brot, Conch. Cab., i, Abth. 24, p. 287, pi. 28, figs. 14, a, b, ; 15. 
1878 M. oncoides Tenison Woods, Pr. Linn. Soc. N.S.W., iii, p. 5. 
1882 M. tatei Brazier, n.n. for tetrica Conrad (non Gould), Pr. Linn. 
Soc. N.S.W., vi, p. 551. 
1882 M. Balonnensis Conrad. Tate and Brazier, Pr. Linn. Soc. N.S.W., 
vi, p. 560. 
1882 Id., Smith, Journ. Linn. Soc. Lond., Zook, xvi, p. 257, pi. 5, figs. 1-3. 
1882 M. subsimilis Smith, op. cit., p. 262, pi. 5, fig. 13. 
1896 M. balonnensis Conrad. Tate, Horn. Exp. Zook, ii, p. 209. 
1896 M. tetrica Conrad. Tate, op. cit. 
1897. M. subsimilis Smith. Tate, Tr. Roy. Soc. S. Aust., p. 43. 
Sise. — Length, 25 mm,; breadth 11 mm. 
Localities. — Murray Eiver ( J. A. Kershaw) ; Gayfield, 
Bannerton (A. C. Nilson) ; Ned’s Corner (F. A. Cudmore). 
Vernacular Name. — The Balonne River Melania. 
Observations. — In this species, as in other members of the 
genus, the apex, which is perfect in the juveniles, is usually 
eroded or truncate in larger specimens. Smith notes its wide 
distribution in Australia and remarks: “The colour, as well 
as the sculpture, is subject to considerable variation. Some 
specimens are uniformly olivaceus, whilst others are closely 
spotted with small streaks and minute dots of a dark red, the 
latter being pretty constantly upon the spiral raised ridges. 
