NOHTH BRITISH TESTACEA. 38 I 



M. Musselburgh Sands, scarce. 

 D. 



M. New shell, Dunbar, scarce. 

 M. New shell, dredged in the 

 Frith of Forth, rare. 

 P. M. D. A single dead valve has just 

 been found near Gosford- 

 House, .Aberlady Bay. 



MACTRA. 



Animal a Tethys. Shell bivalve, unequal sided, 

 equivalve. Middle tooth of the hinge compli- 

 cated, with a small hollow on each side. Late- 

 ral ones remote, and inserted into each other. 



1. solida. P. D. M. Portobello Sands, not un- 



common. 



2. truncata. D. M. Musselburgh Sands, not un- 



common. 



3. subtruncata. M. P. Portobello Sands. Pennant 



has unluckily given this 

 name to our M. stultorum. 



4. lutraria. P. D. M. Tyne and Portobello Sands, 



and plentifully in Aber- 

 lady Bay. 



5. stultorum. -%D.M. Leith Sands and other parts 

 Tellinaradiata. 3 P. of the coast, plentiful at 



times. 



6. tenuis. M, Musselburgh Sands, rather 



scarce. 



Cardium. 



8. exiguum. 1 

 pygmseum. 3 



9. fasciatum. 



10. spatula. 



11. lsevigatum. 



