55g 



Pholas ftriata. Doti Br. Shells, iv. t. 117. Striatu. 



Favan. t, 60. F. 2. 3. 6.9.— Gualt. t. 105. F. p. 26. 



This is by feme called Pholas lignorum, or Dutch 

 wood-mufcle. 



e«seae^lS£)®'<^^®S@£6eseeto 



BIVALVE, 



MYA. 



Mya dubia. Don. Br. Shells, iii. t. 108. Pkoladia, 



Plentiful at Torhay, in fragments of lime flone, driven 

 on fliore by winter florms, but is not to be found in the 

 rocks, which are ever uncovered by the loweft ebb tides ; 

 and of courfc is rarely obtained alive : in this flate, how- 

 ever, we have procured it, and proved beyond doubt, 

 that it cannot belong to the Pholad.es, as it is void of 

 acceffory valves. 



The perforations in which thefe fliells are concealed, 

 are fometimes lined with a concreted, calcareous fub- 

 ftance, clofely connefted with the reft of the ftone, and 

 equally hard, compofed of feveral coats, or lamina, of 

 a different texture, not unfrequently half a line, or more, 

 in thicknefs : the openings to thefe chambers are fmall, 



and 



