TESTACEA FROM THE PLEISTOCENE MARL OF MOWBRAY SWAM! 
been introduced ? " In discussing the question of the importation 
ot tins shell, on the grounds of its determination as Physa Dr. 
Noetling* points out that the association of the remains of a giant 
marsupial goes to prove that it is indigenous. The present 
determination, that it is a distinct type from Physa, although 
outwardly resembling it, affords another instance of convergence 
of external form in different organisms. 
Two minute specimens of Bulinus were also found accompanying 
the shells of B. tasmanicus in this deposit ; and these were at first 
thought to represent a new specific type, on account of the few 
whorls and exceptionally globose protoconch. On comparing the 
latter characters, however, in a series of B. tasmanicus a groat range 
of variability was found in regard to the form of the apex ; and the 
natural conclusion is, that these specimens represent the embryonic 
shells of B. tmma/nicus. This species, by the way, appears to connect 
B. nitida and B. eburnea, the former having a short shell with a large 
aperture ; the latter a shell with the aperture narrow, ovate, and 
shorter than the spire. 
Dr. Noetling also records this species from the above locality. 
Amphipeplea subaquatilis, Tate, var. neglecta, Pettcrd. 
Limncea subaquatilis, Tate, var. neglecta , Petterd, 1889, Proc. Roy. 
Soc., Tas., for 1888, p. 66, pi. II., fig. 13. 
This interesting little species is here represented by two specimens, 
typical in all points but that of size, the length of the larger example 
being 3mm., against 7mm. in Petterd ’s specimen. It differs from 
the European L. peregrer , Draparnaud, in the less expansive aper- 
ture and more slender form of the shell. 
Vitkina milligani, Pfeiffer. 
Vitrina milligani, Pfeiffer, 1852, Monographia heliceorum viven- 
tium, vol. III., p. 4. Cox, 1868, Mon. Austr. Land Shells, p. 82, pi. 
XIV., figs. 2, 2a. 
A bleached and somewhat imperfect shell of the above occurs in 
the marl. The species has already been recorded by Dr. Noetling 
from the same locality. 
OSTRACODA. 
Genus Candona, Baird. 
Candona lutea, King. 
(Plate II., Figs. 6 a, b, 7.) 
Candona lutea, King, 1855, Proc. R. Soc., Tas., vol. III., pt. I., 
p. 67, pi. X., fig. K. 
C. lutea, King, Brady, 1886, Proc. Zool. Soc., Bond., p. 92, pi. 
VIII., figs. 10, 11, pi. X'., figs. 7, 8. 
Observations. This species is excessively common in the Mowbray 
Swamp deposit. There is a fair amount of variation in the carapaces 
* Pro c. Roy. Soc. Tasmania for 1911, 1912, p. 128. 
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