100 POPULAR CONCHOLOGY. 



chantable pearls are offered for sale by these 

 people every summer assizes. Some gentlemen 

 of the country make good advantage thereof, 

 and myself heard that a miller took out a pearl 

 which he sold for 41. 10s. to a man that sold it 

 for 10/. ; the last purchaser sold it to the late 

 Lady Glenlealy for 30/., with whom I saw it 

 in a necklace : she refused 807. for it from the 

 late Duchess of Ormond." 



Between the years 1761 and 1764 the pearls 

 found in the mussels of the river Tay were 

 worth 10,0007. It is not uncommon now to 

 find pearls which are sold for one or even two 

 pounds. 



I 59. Unio. — Shell thick and solid, trans- 



verse, equivalve, inequilateral; bosses promi- 

 nent and eroded ; cardinal teeth solid, short, 

 and oblique ; ligament external. Animal, foot 



