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



and even sometimes within the mouth. Tab. 

 Iv. Jg. 3. 



12, HIANS, Mya oblonga. Cm. Lin. Lin. Tr. viii. 74. 



3221. 31on(. Test. B' . 101. 



* M. with an oblong russed 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, CornxcaU, and De'vomhire 

 coasts. ^ 



13. TRUNo Mont. Test. Br. Sup. 34. 



CATA. 



* ]\I. with a triangular shell, very strong, 

 smoothish, sides flattened, truncated ; length 

 an inch and a half, breadth an inch and three 

 quarters. 



Frith oi Forth. 



14. CINEREA. Munt. Test. Br. Sup. 3.5. 



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

 of a cinereous color ; back large and very pro- 

 minent. 



Weymouth. 



