51 



PANDORA. 



TELLINA INEQUIVALVIS. — LiniimiS. 



-^v 



Sowerbys Genera, No.2,pl. 6. 



The hinge of the Pandora bears some resemblance to 

 that of the Placuna, but the shells of this genus have 

 two muscular impressions, and are more nearly allied 

 to the Corbula. Shell inequivalve, inequilateral, trans- 

 versely oblong; the upper valve flattened, the lower 

 convex; two primary teeth, divergent and unequal, on 

 the upper valve ; two oblong corresponding cavities on 

 the lower: ligament interior. 



Pandora rostrata Pandora obtusa. 



SAXICAVA. 



mytilus pholadis. — Linnceus. 



Muller 3, tab. 87,/. 1,3. 



i 

 These shells inhabit holes pierced by the animal in 



rocks or stones, from which they cannot remove, re- 

 sembling, in that respect, the Pholades. Shell bivalve, 

 transverse, inequilateral, obtuse, and gaping at both 



e 2 



