THE FRESHWATER MOLLUSCA OF VICTORIA 
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body- whorl than P. gibhosa var. adamsiana Caiiefri and 
those of the spire are perhaps more regular in their enlarge- 
ment. The colour, too, is not so olivaceous, being rather 
yellower in tint. P. attenuata Sowerby, from Tasmania, has 
a less acmninate spire, and the body-whorl is conspicuously 
narrow in proportion to the preceding whorls. P. gibhosa, 
however, may eventually include this species, as certain 
slender forms approach it very closely.” 
Genus ISIDOEELLA Tate, 1896. 
Isidorella newcombi (A. Adams and Angas). 
(PI. II, Fig. 22.) 
1864 Physa Newcombi A. Adams and Angas, P. Z. S., Lond, p. 416. 
1874 Id. Sowerby, Conch. Icon., xix, pi. 3, fig. 21. 
1874 Physa subinflata Sowerby, op. cit., fig. 6a, sp. 5. 
1882 Physa Newcombi Ad. and Ang. Tate and Brazier, Pr. Linn. Soc. 
N.S.W., vi, p. 555. 
1882 Id. Smith, Journ. Linn. Soc. Lond., Zool., xvi, p. 280. 
1882 Physa Brazieri Smith, op. cit., p. 286, pi. 6, fig. 22. 
1885 Physa newcombi Ad. and Ang. Clessin, Conch. Cab., i, Abth. 17, 
p. 299, pi. 43, fig. 6. 
1887 Id. Cooke, J. Conch., v., p. 242. 
1887 Limnaea physopsis Cooke, op. cit., p. 243, pi. 2, figs. 1-4. 
1889 Id. Cooke, P. Z. S. Lond., pp. 137-140, figs. 7, 7a (radula). 
1892 Bulinus Newcombi (Ad. and Ang.) Bednall, Tr. Roy. Soc. S. 
Aust., xvi, p. 67. 
1906 Isidorella newcombi (Ad. and Ang.) Tate, Kept. Horn Exped., ii, 
Zook, p. 213, pi. 19, fig. 25. 
1917 Isodora newcombi (Ad. and Ang.) Odhner, K. Sv. Vet. Ak. Handl., 
lii (16), p. 74. 
1917 Id. Hedley, Rec. Aust. Mus., xii, No. 1, p. 8. 
1932 Isodorella newcombi (Ad. and Ang.) Cotton and Godfrey, S. Aust. 
Nat., xiii. No. 4, p. 159, pi. 2, fig. 4. 
Size of Type. — Length, 21 mm.; breadth, 14'6 mm. 
Localities. — Cheltenham, St. Kilda, Tatura (Nat. Mus., 
Melb.) ; Meredith (J. H. Young) ; Stawell, Bacchus Marsh 
(F. L. Billinghurst) ; Serviceton (T. Worcester) ; Werribee 
(W. T. Bednall) ; Larpent (A. C. Nilson) ; Melbourne 
University Lake. 
Vernacidar Name. — Newcomb’s Pond-Snail. 
Observations. — A thin, ovate-globose, brownish shell with 
finely, spirally-striated whorls. Tate, in dealing with the 
Horn Expedition Mollusca from Central Australia, recorded 
this species and made the following observations: “I. neiv- 
combi and its varieties have the test covered by a horny 
periostracum raised into spiral fringes of hairs and into 
