Fossils from Australia. 153 
not much inflexed.—Len oie of hinge line 1 aa depth of ¢ con- 
cavity below, over half an inch.—This species is very unlike the dra- 
chytherus in its = ee. beak and longer hinge line. It is near * 
the rugosus, but is much thicker and more convex above.—Jllawarra. 
15. Solen {Siolspairtin ?) ial —Shell very slightly yA ay very 
regularly elliptical, with no trace of a beak, breadt little less than 
anterior margin slightly depressed, and perhaps two or three faint radi- 
ations from the hinge over the lateral surface (apparent in the cast of 
the under surface of the valve, but not of the upper); cast of the hinge 
phowing. 6 teeth aoe apparently perfect—Length 1-4 inches ; 
height 48, L.—Illaw 
16. Shon (Salebaictine 2)  Relemmartee —Shell flat except a slight 
bending over the postero-do rsal portion ; no beak, elliptical in outline 
with the inferior and dorsal margins straight, and the anterior and pos- 
terior extremities of equal breadth; breadth more res + If the ee 
surface smooth with some faint concentric undulations and lines 
growth, apparent especially near inferior margin ; no epalleat or a 
cular impressions visible—Length 12 inch; height 748, L.—Har- 
per’s Hill 
17, Pholadomya undata.—Nearly or quite equivalve, oblong trans- 
verse, subelliptical ; beak projecting ie little ; thinning to an acute edge 
in front, prolonged and narrowing s mewhat behin ; sides flattened, 
posterior surface from the beak to she posterior angle obliquely trun- 
d exteriorly subcarinate ; cardi linear, circumscribed 
surface with a few irregular obsolescent longitudinal plice or undula- 
tions, smooth, crossed, especially below, by faint radiations.—Length 
315 inches; height yo L; thickness ;85, L; distance of summit of 
beak from anterior margin 3%; L; apical angle 138°; pecans: of 
beak above cardinal margin pate E-eigith of an inch.—IJ/aw 
18. Allorisma audax.—Transverse, very inoguilaiatacl "left sere 
largest, front very broad and flattened, and having a narrow area ad- 
joining the margin extending down from the beaks which is a a 
po ing a 
somewhat recurved, gaping ; beaks very large and prominent, incurved, 
i cdi lateral surface anterior to middle strongly flattened, or even 
concave ; surface unevenly plicate and having some faint radiations lat- 
erally and pombauely, plications large rounded and smooth, the alter- 
hate mostly becoming obsolete = middle of lateral surface. 
Length 43 inches; height °%; L; thickness 4% L; the beaks are 
much more prominent than in the A. curvatum, the posterior extremity 
much a the flank less inflated, and the front more abruptly trun- 
cate.—Illaw 
Srconp Slaie Vol. Iv, No. 10.—July, 1847. 20 
