479 
Ois. G. ruqom is a very wide-spread and typical shell, as not only does it occur 
at several localities in Queensland, but I have it in X^rof. Tate’s South Australian 
Collection. Moore’s figure is most unsatisfactory, and generally unlike the shell, but 
possessing specimens from the typical locality, and not having seen any other shell so 
nearly correspoirding with his species, I believe the determination to be correct. The 
hinge structure has not been satisfactorily made out, while it seems to be a shorter and 
broader form than Moore’s M.ya 3Iacco}/i, although the latter is not definitely known 
to me. 
Qlycimeris rugosa seems to be distinguished from G. sulcata, Etheridge, by its 
more robust habit and the less rugged condition of the concentric undulations. One 
of the most striking features of G. rugosa is its anterior inflation, but I think the 
anterior margins are closed, in which case the species departs somewhat from the generic 
diagnosis of Glgoimeris, Klein {FanogcBa, Menard). The concentric undulations on the 
umbones are particularly regular and close. 
Prof. T. "VY. E. David has collected an internal cast at Maryborough,*’ which 
appears to be too large a shell for G. sulcata, Etheridge, and may indicate the presence 
of the present species at that locality. 
A striking resemblance exists between this S2)ecies and Mr. Xludleston’s 
Myacites? australis, which, it is almost needless to say, has no relation to typical 
species of that genus. There are the same prominent umbones, square anterior end, 
and rather attenuated posterior end, and when seen in a side view the likeness is very 
marked. It must be admitted, however, that G. rugosa has a more generally solid 
appearance, and is a broader shell across the valves. Although Myacites ? australis 
cannot be described as a compressed form, still its girth is less in proportion to size 
than in the present species. Notwithstanding these differences, I do not think that the 
one can be regarded as more than a compressed variety of the other. 
Mr. Hudleston drew attention to the general resemblance of his species to the 
shells figured by Mr. Etheridge as Panopoea sulcata, but, although generically allied, 
there is no specific relation. 
Joe. and Horizon. Bungeworgorai Creek, near Mount Abnndance {The late 
Pev. W. J3. Clarice') ; Maranoa Eiver, half a mile above Mitchell Eailway Station, PI. 28, 
figs. 4 and 5 (E. L. Jack) ; Maranoa Eiver and Wollumbilla {G. Sweet — Colin. Sweet, 
Melbourne). 
Myacites? australis was obtained in the Peak District, South Australia, 
and forty-five miles south-west of Cootanoonna Station, Lake Eyre {H. Ei J. Prown— 
Nat. His. Mus., London). 
? Occurs also in the Maryborough Beds (Desert Sandstone) {T. W. E. David — 
Colin. David, Sydney). 
Gitoimeeis aeamacensis, sp. nov., PI. 28, figs. 7 and 8. 
Sp. Char, Shell small, transversely elongated and a little oblique, gaping at both 
ends, somewhat compressed. Anterior end small, the margin rounded ; posterior end 
slightly attenuated, the margin apparently rounded, and to some extent truncate; 
'V'entral margin sharp and nearly straight. Dmbones much inenrved, obtusely flattened 
from above ; posterior slopes small, flattened ; diagonal ridges acute, especially towards 
the umbones. Anterior slopes very short and wider than the posterior ; shell probably 
tfiin. Surface with coarse, large, and almost rugged concentric undulations, fourteen to 
Maryborough Beds — Desert Sandstone. 
