TESTACEA FROM THE PLEISTOCENE MARL OF MOWBRAY SWAMP. 
GASTEROPODA. 
BYTHINELLA NIGRA, Quoy and Gaimard sp. 
Paludina nigra, Quoy and Gaimard, 1834, Voyage Astrolabe, vol. 
III., p. 174, pl. LVIII., figs. 9-12. 
Bythinia legrandi, T. Woods, 1876, ibid for 1875, p. 76. 
B. tasmanica, T. Woods, 1876, ibid, p. 77. 
Bythinella exiqua, T. Woods, 1878, ibid, for 1877, p. 71. 
Potamopyrgus nigra, Quoy and Gaimard sp., Petterd, 1889, ibid, 
for 1888, p. 69, pl. IIL, figs. 2-8. 
Bythinella nigra, Quoy and Gaimard sp., Noetling, 1912, ibid, 
for 1911;-p. 129: 
The above species is the commonest mollusc in the Mowbray 
Swamp deposit. It agrees with the normal form figured by Quoy 
and Gaimard, and only slightly varies in height of spire and tumidity 
of whorls. None of the specimens show any variation towards the 
varieties legrandiana, Brazier*, or unicarinata, T. Woodsy. 
This species has been recorded by Dr. Noetling from the same 
locality as above. 
ASSIMINEA TASMANICA, T. Woods. 
Assiminea tasmanica, T. Woods,’ 1876, Proc. R. Soc., Tas., for 
1875, p. 79. 
Rissoa (Setia) sienne, T. Woods, 1877, p. 153. 
Assiminea tasmanica, T. Woods, Petterd, 1889, Proc. R. Soc., 
Tas., for 1888, p. 77, pl. IL., fig. 2. 
A. tasmanica, T. Woods, Gatliff, 1905, Vict. Nat., vol. XXIL., 
p. 15. 
The present specimens agree with the original description by 
Tenison Woods, and, to some extent, with Petterd’s figure referred 
to above. The latter, however, does not do justice to the shell in 
showing the characteristic acute spire and sub-angularity of the 
last whorl. Some examples of the species from Port Albert, Victoria, 
which I have been enabled to examine through the kindness of Mr. 
C. J. Gabriel, have, however, a decidedly inflated outline. The figure 
of A. tasmanica given by Mr. Hedleyt is suggestive of A. brazeri, 
T. Woods, in its obtuse spire, sub-globose shell with rounded whorls, 
and colour bands. These colour bands are absent from typical 
examples of A. tasmanica, as also from our fossil specimens, which, 
when moistened, show all other colouration originally present. 
The present genus and species does not appear in Dr. Noetling’s 
list. 
GEeNus Butinus, Adamson, 1757. 
Note on the genus.—The common Australian sinistral pond- 
snails have been variously ascribed to Physa, Bulinus, Isidora, and 
Aplexa. Under the genus-name Bulinus, Prof. R. Tate has made 
* Proc. Zool. Soc. Lond., 1871, p. 698. “‘ Paludestrina legrandiana.” 
+ Proc. R. Soc. Tas. (for 1875), 1876, p. 77. ‘‘ Bythinia wnicarinala.” 
{ Proc. Linn. Soc. N.S. Wales, vol. xxx., 1905, p. 527, pl. xxxii., fig. 27. 
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