TESTACEA FROM THE PLEISTOCENE MARL OF MOWBRAY SWAMP. 
GASTEROPODA. 
Bythinella nigra, Quoy and Caiman! sp. 
Paludina nigra, Quoy and Gaimard, 1834, Voyage Astrolabe vol 
III., p. 174, pi. LVIII.; figs. 9-12. 
Bythinia legrandi, T. Woods, 1876, ibid for 1875, p. 76. 
B. tasmanica, T. Woods, 1876, ibid, p. 77. 
Bylhindla exigua, T. Woods, 1878, ibid, for 1877, p. 71. 
P otamopyrgus nigra, Quoy and Gaimard sp., Petterd, 1889, ibid 
for 1888, p. 69, pi. ill., figs. 2-8. 
Bythinella nigra, Quoy and Gaimard sp., Noetlimn 1912 ibid 
for 1911, p. 129. 
Tbe 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. Soe. Tas for 
1875, p. 79. ’ 
Rissoa ( Setia ) siennas, T. Woods, 1877, p. 153. 
Assiminea tasmanica, T. Woods, Petterd, 1889, Proc. R. Soe 
Tas., for 1888, p. 77, pi. II., fig. 2. 
A. tasmanica, T. Woods, Gatlifi, 1905, Viet. Nat., vol. XX 11 
p. 15. 
r '( 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. HedleyJ is suggestive of A. brazieri, 
1. 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. 
ihe present genus and species does not appear in Dr. Noetling’s 
list. 
Genus Bulinus, Adamson, 1757. 
Note on the genus. — The common Australian sinistral pond- 
snails have been variously ascribed to Physa, Bulinus, Isidora, and 
Ajdexa. Under the genus-name Bulinus, Prof. R. Tate has made 
* Proc. Zool. Son. Lond., 1871, p. 098. “ Paiudestrina legrnn4ia-m.” 
I Proc. K. Sop. Tas. (for 1875), 187(5, p. 77. “ Bythinia unimrimiln 
t Proc. Linn, Soc. N.S. Wales, vol. xxx., 1905, p. 527, pi. xxxii., fig. 27. 
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