TESTA CBA PROM THE PLEISTOCENE MARL OP MOWBRAY SWAMP. 
some having the postero-dorsal angle obtuse, as in a typical Candona, 
although the majority are more evenly rounded than usual in that 
genus. A young individual is here figured, which goes to show 
the identity of the specimen from the Tweed River, New South Wales, 
figured by Dr. Brady as doubtfully belonging to this species (loc. 
supra cit., pi. VIII., figs. 10, 11) ; since graduated examples linking 
both forms may be found here. The living examples previously 
recorded were all from New South Wales. 
The carapaces of some examples in the present series are so well 
preserved as even to show remains of the dried animal within, though 
in a powdery condition, whilst the dull yellow colour of the original 
shell is evident in most of the specimens. 
Genus Limnicythere, G. S. Brady. 
Limnicythere mowbrayensts, sp. nov. 
(Plate II., Figs. 8, a-c.) 
Description. — Carapace very minute; measuring •46mm. in 
length, -27mm, in greatest height (in the anterior third), and • 17mm. 
in the thickness of the carapace. Seen from the side, subrectangular ; 
dorsal margin almost straight ; ventral edge with a broad median 
re-entrant angle ; anterior border rounded, truncately so on the 
dorsal region ; posterior boldly rounded. There are three rounded 
tubercles situated a short distance from the dorsal margin in the 
antero-median area, and one large, prominent tubercle near the 
middle of the ventral border directed dorsally. Anterior border 
finally crenulate ; post-ventral area with a border of minute 
aeuleations. Anterior margin compressed and flange-like. Surface 
of carapace finely sculptured with a thread-like reticulated or areolate 
ornament. 
Observations.- Phis form, although distinct from any species 
known to me, approaches the type of Limnicythere inopinata, Baird 
sp.; a form common in ditches, lakes, and running streams in Sweden, 
Holland, and Great Britain ; and also occurring as a pleistocene 
fossil in Scotland and England. It is especially related to that 
variety of L. inopinata known as var. compressor , which occurs in 
Whitcfield Loch, Wigton shite, Scotland. That variety differs in 
the absence of the quadruple tuberculation and in the general 
contour of the carapace in edge view. 
Limnicythere mowbrayensis is common in the marl deposit of 
the Mowbray Swamp, Tasmania. This appears to be the first 
record of the genus Limnicythere in Australasia. 
In conclusion, my best thanks are due to Mr. C. J. Gabriel for 
valued assistance in the literature of the mollusca discussed ■ to Mr 
J. Wilson for kindly allowing me to examine his shdes of molluscan 
radulse ; and to Mr. W. L. May, for some valuable notes on the local 
forms. 
* Brady and Norman. 
18, 19. 
Trans, R. I )ubl. Soc., 
ser. 2, vol. iv„ 1889, p. 170, pi. xvii., figs. 
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