571 
latter in his “ Systeme’ ’ it is equal to Crytodaria, Daudin. In this sense Panopea, Menard, 
simply becomes a synonym. The two species described by Mr. Moore it is almost 
impossible to recognise, the figures are so indefinite and badly executed. They may be 
here described under other names, but in such cases this cannot be avoided. 
Gltcimeeis sulcata, Etheridge, sp., PI. 17, fig. 18. 
Panopcea sulcata, Etheridge, Quart. Journ. Geol. Soo., 1872, xxviii., p. 342, t. 21, f. 2 and 2a. 
Sp. Char. Shell oblong, transversely or ovately elongated, thin, with many 
concentric, deeply sulcated plications or furrows ; umbones pointed, anterior side much 
rounded, posterior side acute. {Etheridge.) 
Ohs. This shell resembles P. orientalis, Porbes * ; but the concentric sulcations 
arc fewer and coarser, the posterior margin is more acute, and the umbones slightly 
more central. It also much resembles P. Prevosti, D’Orb.,t but our shell is more 
coarsely plicated than eitlier of the abovenamed species. {Etheridge.) 
Crushed examples appear to be plentiful in the Maryborough Beds. What 
appears to be a short variety also exists with few and exceedingly coarse concentric 
ribs. Individuals of Q. sulcata vary greatly in appearance, both as regards the 
coarseness of the furrows on the surface, and the marginal outline of the anterior end. 
Impressions of the thickened hinge-margin are usually' well displayed on these casts. 
The posterior end gaped but little. 
This is certainly distinct from G. rugosa, Moore, judging from the form and 
concentric, corrugated lamiu®, but it may be allied to Moore’s My a Maccoyi. The later 
Author says that the anterior margin of his species is truncated and angular, and so is 
that of G. sulcata. If the former is also a somewhat long and narrow shell, resembling 
a specimen in Prof. Tate’s South Australian Collection, the resemblance is intensified. 
Specimens of this species are always so crushed that it is difficult to say what the precise 
structure of the dorsal margin was — whether a ligamental fulcrum existed as in 
Glycimeris, or a cartilage process as in Mya. 
The variety is short and obtuse, and is distinguished by having the length much 
less in proportion to the width (PL 17, fig. 18) than the species proper. It may 
perhaps represent a distinct species. 
Loc. Maryborough {The late E. Eaintree) ; Corporation Quarry, Maryborough 
{W. H. Rands ; and Q. Sweet — Colin. Sweet, Melbourne). 
Gltcimeeis etjuosa, Moore, sp., PI. 28, figs. 4 and 5, ? f. 6. 
(For description see under “ Rolling Downs Beds,” p. 478.) 
Eoc. Prof. T. W. E. David has collected an internal cast in the Corporation 
Quarry, Maryborough, which appears to be too large a shell for G. sulcata, Eth., and 
may indicate the presence of the present species. 
Occurs also in the Rolling Downs Beds. 
Genus — CEROMYA, L. Agassiz, 1842. 
(Etudes crit. Moll. Foss. 2e., p. 25.) 
Ceeomta ? sp. ind., PI. 26, fig. 20. 
Ohs. Tills ill-preserved, although stratigraphically important, cast is pro- 
visionally referred to the present genua. One valve is much crushed, but the other is 
* Trans. Geol. Soc., 2nd. Ser., vil., p. 139, t. 17, f. 4. 
tPal. Fran?. Terr. Oret., 1843, iii., p. 334, t. 35G, f. 3 and 4. 
