156 Fossils from Australia. 
the muscle; large anterior somewhat excavate, without vertical striz, 
small anterior obliquely excavate ; palleal impression not very distinct. 
Cast with antero-lateral surface of beak strongly flattened in two parallel 
planes, that adjoining the anterior muscular impression a little concave. 
—Length of cast 14 inch; height 448, L; thickness 75%, L; apical an- 
- impression and other characters distinguish it.—I/lawarra. 
Genus Carvinta, (Ag.)—Form of the species below-described, trans- 
leal impression entire, and not quite reaching to the anterior muscular 
al 
very thin; surface quite smooth with fe Leng ; 
height 4,3, L; thickness .2°; L; apical angle 125°. The cast resem- 
bles much Verneuil’s Solemya primava, pl. xix, Illawarra. 
30. Cardinia cuneata.—Very inequilateral, length about twice the 
rom lateral surface by a strong carina, very long, extending — 
to posterior margin.—Length of cast 14 inch; height 7% L; thick- 
ness ;29; L; apical angle of cast 110°.—J/lawarra. 
enus Pyramus, (nov. gen.)—Equivalve, somewhat inequilateral, 
transverse, elliptical, with the front and posterior margins nearly alike, en- 
tirely closed ; beak somewhat prominent. Ligament external. Palleal 
impression entire, distant from the margin. Three muscular impressions 
to each valve, two anterior and one posterior; the larger anterior, sub- 
orbicular, smaller anterior, facing the same way with the larger, an 
situated just above iis upper angle; posterior faint. Surface mark 
with concentric lines o th. Cast of summit of beak a slender 
point. Shape nearly of Donacilla and Sanguinolaria, but it differs in 
t m 
its entire palleal impression, and has also two anterior muscular im- 
