277 
Ohs. The shell has undergone erosion about the umbones and dorsal margin, 
which gives it a rather inequivalve appearance. Its generic affinities are obscure, but it 
resembles several forms of Cypricardella lately described by Professor De Koninck. It 
is certainly undescribed as an Australian species. 
Loc. and Sorizon. Near Mount Hamilton, sis miles north-east of G-ympie 
(i2. L. Jaeh ) — Gympie Beds, 
Genus — ASTABTILA, Bana, 1847. 
(American Journal Sci., iv., p. 155.) 
Astaetila cytueeea, Bana, PI. 14, figs. 3 and 4. 
Aatartila cytherea, Dana, American Journ. Sci., 1847, iv., p. 155. 
„ ,, Dana, Geology Wilkes’ U. S. Explor. Exped., Vol. x., p. 090, Atlas, t. 4, f. l-ljf. 
8p. Ohar. Shell rhombic-ovate, sub-compressed. Hinge-line straight, ventral 
margin rounded, and moderately sharp at the gape. Anterior end rather acumi- 
nately produced, small, its margin sharply rounded ; posterior end rounded, without 
emargination, TJmbones quite anterior, and much incurved and elevated; a deep 
but not circumscribed luuule present. Surface very characteristically marked by 
regular flattened, non-imbricating, oblique, concentric lamiuje, separated by shallow, 
narrow grooves, gathering together in bundles on the anterior end, and more or less 
striate. 
Ohs. The shell now under description approaches very closely, if it is not 
identical with, Astartila cytherea, Dana, which it resembles in general outline, the 
oblique hinge-line, and high and elevated incurved beaks. It also has a general 
resemblance to Morris’s figure of a young individual of B achy damns globosus,* but the 
beaks are much smaller, and the anterior margin loss defined and more excavated. It 
is, however, an open question if the figure quoted is a Pachydomus at all. 
The present shell equally resembles Pachydomus ovalis, McCoy,t and it is 
even possible that this, and the shell referred to as figured in Dana’s work, are 
identical. 
Loc. and Horizon. Stouehumpy Creek, Bowen Elver (A/. Edelfelt ) — Middle or 
Marine Series, Bowen Eiver Coal Field. 
Order-CHAMACEA, 
Family— TEIDACNID^. 
Genus — EUBYBESMA, Morris and Soiverhy, 1845. 
(Strzelecki’s Pliys. Descrip. N. S. Wales, &c., p. 275.) 
Ohs. Amongst the many interesting occurrences of New South Wales marine 
Permo-Carboniferous fossils in Queensland, not the least is that of a Eurydesma. The 
specimens, although calcified throughout, are much decorticated by weathering, 
^ut the outline of the two valves when united, the straight po.sterior hinge, and the 
deeply excavated lunular space, are all unmistakable evidences of the genus Eurydesma. 
In the umbonal region the shells are very thick, quite an inch, and the structure of the 
shell is very beautifully seen in some places, whilst the rugged cartilage furrows of 
the hinge are equally apparent. 
* Strzelecki’s Phys. Descrip. N. S. Wales, &c., 1845, t, 10, f. 3. 
t Ann. and Mag. Nat. Hist., 1847, xx., p. 302, t. 14, f. 4. 
