196 MACTRA. FLAT-SIDED COCKLE. Cl.VI. 



and even sometimes within the mouth. Tab. 

 lv. Jig. 3. 



12. hians. Mya oblonga. Gm. Lin. Lin. Tr. viii. 74. 



3221. Mont. Test. Br. 101. 



* M. with an oblong rugged shell, the anterior 

 extremity gaping, and the margin having some 

 degree of flexure; length two inches and two 

 and a half, breadth four or five inches. 



On the Dorset, Cornwall, and Devonshire 

 coasts. 



13. trun- Mont. Test. Br. Sup. 34. 



CATA. 



* M. with a triangular shell, very strong, 

 smoothish, sides flattened, truncated; length 

 an inch and a half, breadth an inch and three 

 quarters. 



Frith of Forth. 



14. cinerea. Mont. Test. Br. Sup. 35. 



* M. with a thin, subtriangular, truncated shell, 

 of a cinereous color ; back large and very pro- 

 minent. 



Weymouth. 



