SILURIAN BIVALVED MOLLUSCA OF VICTORIA. 
Our fossil, which is the impression of the interior of a left 
valve, shows the presence of transverse striae on the cardinal 
line. 
Horizon and Locality . — Silurian (Yeringian). North of 
Lilydale; presented by the Rev. A. W. Cresswell, M.A. [2267.] 
Family Lunulicardiidse. 
Genus Lunulicardium, Munster, 1840. 
Lunulicardium antistriatum, sp. nov. PI. V., Figs. 62, 63, 
63ff-64, 65 (juv.). 
Description. — Shell vertically sub-elliptical to sub-circular, 
somewhat oblique; generally highly convex. Beaks prominent, 
sub-anterior, incurved, with an external ligamental groove 
situated in front of the beak. Anterior border narrow; 
posterior broad, gently curved and sub-truncate. Surface 
marked concentrically with coarse rugae, and radially striated, 
bearing numerous fine riblets, sometimes showing a granulose 
ornamentation when magnified. 
Measurements. — A typical left valve. Height, 36 mm.; 
length, 30 mm. ; depth of valve, 7 mm. Right valve of a long 
variety— height, 18 mm. ; length, 21 mm. ; depth of valve 6 mm. 
Observations. — The above fossils, from the uppermost beds 
of the Victorian Silurian, at first glance present little difference 
from those figured under the name of ? Cardium striatum bv 
Sowerby* A minute inspection of a fairly long series of Aus- 
tralian specimens shows, however, that, although closely related 
to Sowerby’s species, their costulae are less numerous and more 
distinctly medially grooved, especially towards the ventral 
margin of the shell, and also that the concentric folds are much 
more pronounced. Our species is more oblique than that figured 
by Sowerbv, and in this respect they agree more closely with 
the variety mentioned by that author, from Brindgwood Chace 
(loo cit., p. 614). A specimen of the Dudley shell in the 
National Museum collection shows the multistriate character of 
the external surface very clearly, and that the riblets or striae 
tend to become medially grooved near the ventral margin The 
related British species ranges from the Bala beds to the Lower 
Ludlow. 
* In Murchison’s Silurian System, 183Q, Pt. IT., p. 614, PI. VP Fio- 0 r 7 
striata , Sow. sp., Etheridge, 1888, Foss. Brit. Ids., Vol. P, Palaeozoic^ p i 02 ' ardl0la 
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