276 
M. crassicardia, Tate, 1, p. 121; Harris, 4, p. 325. 
Kocrense.—R. Murray and Muddy Creek. 
Miocenr.—River Murray Cliffs (8.A.). 
OLDER PLioceNE.—Dry Creek-bore, near Adelaide. 
Genus VULSELLA, Lamarck, 1799. 
V. levigata, Tate, 1, p. 122); Harris, &, p. 326. 
EocenEe.—Aldinga Bay (Glauconitic ‘imestone). 
Genus Meina, Retzius, 1781. 
[ Perna, Bruguiere, 1792.] 
M. sp., ate, 1886. 
Eocrenr -—Aldinga Bay (S.A.); also Oamaru formation, New 
Zealand. From both localities known only as casts. 
Melina pererassa, spec. nov. : 
Shell oblong-cuneate, somewhat oblique, equivalved, not 
winged ; test very thick and perlaceous. 
Hinge line, inner margin straight, outer-margin convex ; 
deepest anteriorly (22 mm.), eight to nine moderately deep 
ligamental furrows, marked by arched transverse striz, two 
millimetres, more or less, in width, slightly narrower than the 
interstitial concave areas. 
Anterior margin slightly incurved at the summit of the byssal 
sinus (the left valve has a slight expansion superiorly), slightly 
convex in alignment with byssal sinus, thence roundly sloping to 
the ventral margin, which is narrowly rounded ; posterior margin 
with a slight outward-curving slope. The byssal sinus is in the 
left valve, very long (30 mm.) and narrow (2 mm. at its widest). 
Surface of valves marked by the somewhat crowded edges of 
imbricating lamelle. 
Dimensions.—Hinge line, 42 mm. long; umbo-post-ventral 
diameter, 80; sectional diameter, 32 mm.; greatest thickness of 
test, 15. 
Habitat.—Junction-bed of the Miocene at Grangeburn, near 
Hamilton, Victoria (two pairs of valves in apposition). 
This species offers no distinctive features, except perhaps in 
respect of its convex dorsal margin and its excessively thick test, 
which, after all, nay only be the result of extreme age. It has 
some analogy with P. Lamarcki of the Parisian Eocene. 
FAMILY PINNIIDAL. 
Genus Pinna, Linneus, 1758. 
P. semicostata, Tate, 1, p. 122. 
Miocene.—Aldinga Bay (S.A..). 
Se 
