64 * 
ASTARTE orbicularis. 
TAB. CCCCXLIV.— Jigs. 2 and 3. 
Spec. Char. Lenticular, with many concentric, 
reflected lamellae upon its surface ; edge 
smooth. 
V ery nearly orbicular ; there is a slightly projecting 
angle at the end of the straight hinge line ; the con- 
centric lamellae are not very much elevated, they are 
very numerous. 
A minute shell, found with the following in the same 
stone that produces the Pileopsis, at Anclilf. 
The larger figures are magnified. 
ASTARTE purnila. 
TAB. CCCCXLI Y.—figs. 4, 5 and 6 . 
Spec. Char. Obliquely obovate, slightly con- 
vex, with numerous concentric ridges ; edge 
crenated within. 
The posterior side of this shell is very small with a 
semicircular edge ; the anterior side is produced, and 
obtuse ; the ridges are narrow, slightly elevated, and 
equal to the spaces between them ; by age the shell be- 
comes longer than wide ; the edge is strongly crenulated 
within. 
Fig. 4, shews an old individual ; fig. 5, a middle 
sized one ; fig. 6, is an enlarged representation of the 
insides of the valves. 
Found at Ancliffe by the Rev. George Cookson. 
