39 
ends short, the margins suh-truncate above, obliquely rounded below. 
Umbonal regions much inflated ; unibones dejiressed and contiguous ; anterior 
slopes short, and apparently a little concave ; posterior slopes rounded. 
Sculpture of concentric laminae. 
Ohs . — The specimen is partly an internal cast and partly testaceous, 
l)ut much exfoliated. It is, however, distinct from any of our previously- 
described forms, judging by its dimensions. In 1892 I figured ^ a Glycimeris 
that I referred to G. sulcata, Etheridge. The last named species is, in part at 
least, a synonym of G. rugosa, Moore, sp., hut the present fossil is not 
Moore’s species, nor does my figure referred to represent the latter. On the 
contrary, had we more perfect material to deal with, it is probable that this 
and the subject of PI. Y, Pigs. 10 and 11, would prove to be identical. There 
are certainly some points of resemblanee, although the entire likeness is not 
as close as it might be, bearing in mind that the Queensland specimen was a 
crushed individual. 
Log. — Momba Station, Darling River, near Wilcannia, North-M^est 
N. S. M^ales {JF. Hogarth). 
Uor. — Lower Cretaceous. 
Colin. — Mining and Geological Museum, Sydney. 
Genus — TEREDINA, Lamarck, 1818. 
(Hist. Nat. Anim. s. verteb., 1818, V, p. -138.) 
Teredina opalina, Giirich. 
Tercdina opalina, Giiricb, Neues Jahrb., 1901, Beil.-Bd. XIV, p. 488, t. 19, f. 4’ ^ 
Ohs . — The shells of this species are said by Mr. Giirich to be met with 
in the opalised wood so common in the White Cliffs beds. They are eleven 
millimetres in length by ten millimetres in height. I have not seen an 
example. 
Loc. — White Cliffs Opal-field, near Wilcannia, North-lYest N. S. M^ales. 
Hor . — Upper Cretaceous (White Cliffs Opal Series). 
1 Geol. Pal. Q’land, &c., 1892, t. 27, f. 18. 
