130 
THE FRESHWATER MOLLUSCA OF VICTORIA 
1889 Unio legrandi Pett., Pr. Roy. Soc. Tas., p. 81. 
1900 Diplodon australis (Lam.) Hanley. Simpson, Pr. U.S. Nat. Mus., 
xxii, p. 890. 
1900 Diplodon (Hyridella) australis var. legrandi Petterd. Simpson, op. 
cit., p. 891. 
1900 Diplodon moretonicus (Reeve). Simpson, op. cit., p. 891. 
1921 Diplodon australis (Lam.). May, Check-list Moll. Tas., p. 21, 
No. 155. 
1921 Diplodon moretonicus (Reeve). May, op. cit., p. 21, No. 156. 
1923 Id. May, 111. Index Tas. Shells, pi. 9, fig. 12. 
1923 Diplodon australis (Lam.). May, op. cit., pi. 9, fig. 11. 
1932 Hyridella australis (Lam.). Cotton and Gabriel, Pr. Roy. Soc. 
Viet., xliv, (n.s.), Pt. 2, p. 155, pi. 16, fig. 1. 
1934 Id. Cotton, S. Aust. Nat., xv, p. 113, pi. 2. 
1934 Velesunio balonnensis (Conrad). Iredale, Aust. Zool., viii, Pt. 1, 
p. 59, pi. 3, figs. 1-3 ; pi. 4, figs. 1-3. 
1934 Velesunio danellii (Villa). Iredale, op. cit., p. 60, pi. 3, fig. 4; pi. 
4, fig. 4. 
1934 Velesunio shuttleworthi (Kuster). Iredale, op. cit., p. 60, pi. 3, fig. 
5, pi. 4, fig. 5. 
1934 Hyridunio australis (Lam.). Iredale, op. cit., p. 69, pi. 5, figs. 1, 2: 
pi. 6, figs. 2, 3. 
1934 Hyridunio australis orion Iredale, op. cit., p. 69. 
1934 Velesunio danelli (Villa). Allan, Viet. Nat, li. No. 7, p. 166, fig. 
in text. 
1934 Hyridella australis (Lam.) Thiele, Hdbch. Syst. Weichtierkunde, 
p. 838. 
Size of Average Specimen .— 44 mm.; breadth, 
71 mm. 
Localities. — E. Yarra; R. Tanjil, near Longford; R. Mit- 
chell; Chaika Creek, near R. Murray; Longerenong (J. L. 
Gatliff) ; Birregurra; Lake Lonsdale (C. L. Barrett); R. 
Olenelg (W. H. Dillon) ; R. Goulburn; R. Mackenzie (C. J. 
Gabriel) ; and many localities (Nat. Mus., Melb.). 
Vernacular Name.— The Southern Freshwater Mussel. 
Ohservations . — Our commonest freshwater Mussel, enjoy- 
ing a wide distribution in all Australian States. After 
examining thousands of specimens, I am convinced of the 
specific identity of the many varying forms enumerated in 
the above synonymy. This species is the genotype of 
Hyridella. II. ambigua (Phil.) from New South Wales and 
South Australia is distinguished from H. australis (Lam.) 
by being thinner, higher, more compressed and lighter 
coloured. 
Hyridella angasi (Reeve). 
(PI. IV, Fig. 39.) 
1856 Unio shuttleworthi Lea, Pr. Ac. Nat. Sci. Phil., viii, p. 94 (nom 
preocc.). ^ 
