NORTH BRITISH TESTACEA. 



383 



Venus. 



5. islandica. 

 mercenaria 



6. decussata. 

 literata 



7. exoleta. 



8. undata. 



9. substriata. 



10, ovata. 



at Aros in the Sound of 

 Mull. 



M. D. Aberlady, very plentiful. 

 P. Pennant supposed this spe- 



cies to have been the V. 

 mercenaria of Linne. That 

 shell, though in appear- 

 ance similar to V. islan- 

 dica, possesses a large and 

 beautiful purple spot 011 

 the inside of each valve ; 

 and of this part of the 

 shell the North American 

 Indians form their warn' 

 J>um. 



D. M. Aberlady Bay, very plenti- 

 P. ful, and other parts of the 



coast. 



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



common. 



11. scotica. 



* P. D. M. Portobello Sands, at times 

 not scarce. 

 M. New shell ; came up with 

 the dredge off Isle of May. 

 P. M. From Dunbar coast, rare, 

 though not uncommon 

 from Leith Roads, of a 

 large size. 

 9fj New shell « first described in 

 Transactions of Lin. Soc; 

 Dunbar and Leith Roads, 

 scarce. 



