MOORE—-AUSTRALIAN MESOZOIC GROLOGY. 251 
lateral, moderately convex; umbones flattened, incurved over a 
large and rounded lunule; anterior and posterior ends and dorsal 
margin rounded; surface of the shell with broad irregular trans- 
verse bands of growth. 
Fine examples of this shell are present in the Rev. W. B. Clarke’s 
collection. It is one of the largest of the Australian bivalves, and 
appears to have attained a large size even for a Cytherea. The speci- 
mens are not in good condition. The largest example measures 
6{ inches in breadth by 43 inches in depth. The interior of one 
of the specimens was covered by Polyzoa and Serpule, the casts of 
which are still seen in the matrix. 
Locs. One example is from the Maranoa river, others being from 
Wollumbilla and one from the Gregory, north of Finnis Springs, on 
Stuart’s route from Adelaide to Chambers Bay. 
36. CYTHEREA GIBBOSA, sp. N. 
A second species, much more convex and gibbous, with umbones 
much thickened, is present, but the specimen is too imperfect for 
description. It is from Wollumbilla. 
37. GONIOMYA DEPRESSA, sp.n. Pl. XIII. fig. 6. 
Shell ovately elongated, thin, flattened ; umbones close, depressed, 
mesial; anterior end rounded; the middle of the valves with a de- 
pression or fold from the umbo, which widens to the ventral margin, 
surface with broad curved rounded coste. 
A single specimen, which has lost a part of the posterior end, 
represents this genus. The test is not well preserved, so that the 
entire ornamentation cannot be determined. 
It is from Wollumbilla. 
38. Lupa AUSTRALIS, sp.n. Pl. XII. fig. 7. 
Shell transversely ovate; umbones anterior, contiguous, com- 
pressed; anterior side rounded, posterior side longest, attenuated ; 
hinge-teeth small, numerous ; dorsal surface covered with numerous 
transverse strie. 
Loc. Wollumbilla. 
39. Lucrna anomaLA, sp.n. Pl. XIV. fig. 4. 
Shell nacreous, thin, equivalve, suborbicular, compressed; um- 
bones mesial, close; lunule small, distinct; hinge-line much ex- 
tended, on the posterior side rounded, on the anterior oblique and 
wing-like. 
The surface of the shell possesses very close radiating longitudinal 
strie, decussated by equally close concentric striz which give the 
shell a faintly reticulated appearance. The longitudinal striz are 
more distinctly marked than is usual with the Lucinide. 
Loc. Wollumbilla. 
40, Lucia (?) austrauis, sp.n. Pl. XIV. fig. 5. 
Shell orbicular, or longitudinally ovate, nacreous; umbones mesial, 
