Page:Quarterly Journal of the Geological Society of London, vol. 26.djvu/361

MOORE— AUSTRALIAN MESOZOIC GEOLOGY. - 253 Two examples are in the Australian collection, both of which are from Wollumbilla.

45. Modiola unica, sp. n. Pl. XIII. fig. 5.

Shell small, smooth, obtuse, convex, thickest at the umbones ; umbones subterminal ; hinge-line straight ; anterior side produced and rounded; dorsal surface with a few flattened concentric striae,' which are decussated by very faint longitudinal lines. This little inflated shell is the only example I have seen of the genus.

It is from Wollumbilla.

46. Mya Maccoyi, sp. n. Pl. XIII. fig. 8.

Shell ovately oblong, moderately large, tumid, inequivalve ; umbones anterior, incurved, close ; anterior margin truncated, angular ; posterior end attenuated, rounded, widely gaping ; ventral margin slightly rounded ; surface of the shell with wide irregular lines of growth, the outer surface of the test where best preserved showing it to be very wrinkled. It is 3-1/4 inches broad by 2-1/4 in height. I have only seen one specimen of this species, which has come from a deposit of dark blue limestone. It comes from between the Amby and Maranoa rivers. It is named after Professor M'Coy, who has been for some time engaged in the geological survey of Victoria.

47. PANOPAEA, Sp. n. Pl. XIII. fig. 7.

Shell transverse, ovate, inequilateral, inflated, thickest and broadest on the anterior side ; umbones acute ; hinge-line prominent, with a raised ridge for ligamental attachment ; anterior margin rounded and slightly gaping ; from the umbo on the upper dorsal margin to the posterior side gradually gaping ; surface of the shell with irregular concentric lines, with an external wrinkled shell-structure.

Only one example of this shell is in the collection. It measures 4-1/2 inches in breadth by 2-1/2 inches in height. It comes from the Bungeeworgorai Creek, twenty miles south-east from Mount Abundance.

From the parasitic attachments on the interiors of many of the Australian specimens, they appear to have been dead shells. Two examples of casts produced by the attachment of Cirripedia are to be seen on the interior of this Panopoeaa.

48. Myacites Sanfordini, sp. n. Pl. XIII. fig. 9.

Shell elongate, flattened ; umbones rather anterior, close ; anterior side slightly produced and rounded, posterior side lengthened and attenuated ; front dorsal margin slightly curving, with the edges of the valves close ; both ends slightly gaping.

This shell approaches very closely to M. calceiformis of the Inferior Oolite.

Several specimens of this shell are in the Western Australian collection. It appears to be from the Inferior Oolite. It is named after W. A. Sanford, Esq., F.G.S., to whom I am indebted for the Western-Australian specimens.