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



as an Oyfter ; and the Polifii Saddle by all 

 authors is ranked as an Oyfter. 



I now proceed to Seftion 3, or thofe 

 Bivalves that are inarticulate, or have no 

 teeth on their hinge ; as the Margaritifer^e, 

 Mufcles, &c. PI. I. fig. 13. PI. VII. fig. 

 9, 14, and 15. 



Family II. Margaritiferss, or Pearl, Oy- 

 fters, are eared Shells with equal valves, 

 and their hinge is meerly a gutter or flight 

 furrow, without a fingle tooth. PL VII. 

 fig. 14. 



The fpecies of this family are few : they 

 are the Mother of Pearl Shells or Pearl 

 Oyfters, the Swallow,'&c. I have made a 

 diftinfl: genus of them ; but Lifter calls 

 them Pearly Efcallops : Rumphius, Da- 

 vila, and Meufchen, rank them as Oyfters. 

 Woodward forms a genus he calls Marga- 

 ritiferae ; and defines it as eared Shells 

 with a fmooth hinge ; and Gualtieri de^ 

 fines them by placing the Pearl Shells in 

 5 one 



