118 
THE FRESHWATER MOLLUSCA OF VICTORIA 
imbricating folds at the suture ; the spiral rows of hairs are 
superimposed on the spiral striae of the test; the periostra- 
cum is more developed in some individuals than in others, 
may be partly or wholly removed by abrasion in adult shells, 
and is usually lost in dead ones. This feature has been 
unnoticed by the describers of the several species, which may 
be explained on the probability that their types were dead 
shells. The colour of the test is mainly light-horn, but varies 
from olive-green to brovm and reddish, and cannot be used 
as a specific character. 7. newcomhi and its varieties have 
the habit of burrowing in the mud on the drying up of the 
water of the pool in which they live, and of forming a 
hemispheric operculum of fine silt, thus closing the aperture. 
The fine nature of the material forming the operculum con- 
trasts strongly with the varied texture of the mud of the pool, 
which leads me to infer that the fine sediment has been 
selected by swallowing and ejected per anum.” Tate further 
states 'brazieri merges so gradually into the typical form that 
it can only be regarded as a mere individual variation of 
7. newcomhi; with this I agree. Hedley regarded brazieri 
as a variety of liainesii, not of newcombi. 
Isidorella newcomhi (Adams and Angas) var. liedleyi 
(Clench). 
(PI. II, Fig. 23). 
1864 Physa inflata Adams and Angas, P. Z. S., Lend., p. 39. 
1874 Id. Sowerby, Conch. Icon., xix, pi. 1, figs. 4a, b. 
1882 Id. Smith, Journ. Linn. Soc. Lond., Zool., xvi, p. 280. 
1886 Id. Clessin, Conch. Cab., i, Abth. 17, p. 300, pi. 43, fig. 7. 
1894 Bulinus inflatus (Ad. and Ang.) Whan, Geelong Nat., iv. No. 10, 
p. 8. 
1896 Isidorella inflata (Ad. and Ang.). Tate, Rept. Horn Exp., ii, 
Zool., p. 213. 
1917 Isodora newcombi var. inflata (Ad. and Ang.) Hedley, Rec. Aust. 
Mus., xii. No. 1, p. 8. 
1926 Isidora newcombi hedleyi Clench, Journ. Conch., xviii. No. 1, p. 12 
(new name for inflatus preocc.). 
Size of Type. — Length, 16 6 mm.; breadth, 12'5 mm. 
Localities . — Mount Hope (C. Hedley) ; Cheltenham (T. 
Worcester) ; Irymple (J. H. Young) ; Birregurra (A. C. 
Nilson). 
Vernacular Name. — Hedley ’s Inflated Pond-Snail. 
Observations . — The type came from the Wakefield Elver, 
South Australia. It is a fine, inflated, bulbous form with the 
upper whorls usually semi-opaque and fuscous, and the 
lower whorls more pellucid and of a pale greenish horn- 
