468 
Genus— MOBIOLA, Lamarck, 1799, 
(Prodroino — Soc. Hist, Nat. Paris, 1799, p. 87,) 
Mobiola bkica, Moore. 
Modiola unica, Moore, Quart. Journ. Geol. Soc., 1870, xxvi., p, 253, t. 13, f. 5. 
8p. Ghar. Shell small, smooth, obtuse, convex, thickest at the umbones ; 
umhones suhterminal ; hinge-line straight ; anterior side produced and ronnded ; 
dorsal surface, with a few flattened concentric strise, which are decussated by very 
faint longitudinal lines. (Moore.) 
Obs. This shell has much the appearance of a Litlwdomus. 
Loc. WoWwabiWa, (The late Bev. W. B. Clarke). 
Order— UNIONACEJ:. 
Pamily— IINIONID^. 
Genus — TJNIO, Bhillipsson, 1788. 
(Dissert. His. Nat. Nov. Test. Genera, p. 26.) 
Obs. Two specimens of TJnio were obtained from the sinking of the Government 
Well at Winton. The specimens seem to be distinct from one another, and are both 
small forms. They were presented to the Geological Survey Museum by Mr. Julius 
von Berger. 
Order — AEC ACE A . 
Family — AECIDJE. 
Genus — ABCA, Linneeus, 1758. 
(Syst. Nat., Ed. x., i., p. 693.) 
Aeoa PR.ELONOA, Moore, PI. 33, fig. 7. 
Area prcelonffa, Moore, Quart. Journ. Geol. Soc., 1870, xxvi., p. 249, t. 14, f. 7. 
Sp. Char. Shell transverse, inequilateral ; umbones rather close, anterior ; 
hinge-line long, with nnmerous close-set teeth ; posterior side extended and slightly 
angulated, with a depressed keel crossing from the umbo to the posterior ventral margin. 
Obs. Had it not been for the mention of “ close-set teeth,” I should have 
considered the reference of this shell to Area very doubtful. 
Loc. Wolluinbilla (The late Bev. W. B. Clarke). 
Genus— CUCULLJEA, Lamarck, 1801. 
(Syst. Anini. sans Verteb., p. 166.) 
Cuctrni.®A Heitdebsoki, sp. nov., PI. 26, figs. 2 and 3. 
Sp. Ghar. Shell small, obliquely oblong, gibbous ; cardinal margin straight , 
the area seems to have been wide, and on casts are visible the impressions of three 
lateral teeth, a little oblique to the margin. Umbones prominent, projecting, gibbous, 
slightly more anterior than median; anterior end moderately large, sharp-angled, 
posterior end rather larger than the anterior, obliquely truncated, with a well-marke 
diagonal ridge and posterior slope, with a simple and not emarginate margin ; ventra 
margin nearly straight medianally. Surface with somewhat strong concentric lines, 
apparently crossed by radiating strise. 
