ASTAliTE orbicularis. 



TAB. CCCCXLIV.— ^^5. 2 and 3. 



Spec. Char. Lenticular, with many concentric, 

 reflected lamellse upon its surface ; edge 

 Smooth, 



V ERY nearly orbicular ; there is a sligjhtly projecting 

 angle at the end of the straight hinge Hne ; the con- 

 centric laraella3 are not very much elevated, they are 

 very numerous. 



A minute shell, found with the following in the sau»e 

 stone that produces the Pileopsis, at AuclifT. 



The larger figures are magnified. 



ASTARTE pumila. 



TAB. CCCCXLJ v.— /^5. 4, 5 and 6. 



Spec. Char. Obliquely obovate, slightly con- 

 vex, with numerous concentric ridges ; edge 

 crenated within. 



JL HE 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 AncUffe by the Rev. George Cookson. 



