234 C O N C H O L O G Y. 



But, before I proceed on my fyfrem, I 

 think It neceffary to give a compendious 

 view of the arrangements of Bivalves hi- 

 therto fet forth by the feveral fyliematical 

 authors, in hke manner as I did before 

 with refpeft to the Univalves. 



Lifter begins his hiftory of the fea Shells 

 with the Bivalves, which he divides into 

 two parts, and into tv>^elve families, viz. 

 Part I. is of thofe with unequal valves, and 

 contains three families, as i.the Efcallops. 

 2. the Oyflers, and, 3. the Spondyles. His 

 fecond part is of the Bivalves with equal 

 valves ; this contains the other nine famis- 

 hes, and arc 4. the Margaritiferas. 5. Ma* 

 ny-toothed Cockles. 6. Toothed Cockles 

 'in many fedions and chapters. 7. Mufcles, 

 8. Pinnae. 9. Tellens. 10. Solenes. ii» 

 Chamae ; and 12. Chama Pholas, 



Lifter, in his arrangement, has great 



regard to the charadler of the hinge, though 



he does not entirely build upon it. 



His 



