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



two valves together, that is to fay, the 

 teeth or joints on' which they play in the 

 aftions of opening and (hutting. PI. L 

 %. 13, 14, and 15. PI. VI. fig. I, 2, 3, 

 4, /7. 11^ t. PI. VII. fig. 5, 1 1, and 15. 



9. A hinge is inarticulate w^hen not fet 

 with any vifible joints or teeth. PI. I. fig. 

 PI. VI. fig. 2, 3. PI VII. fig. 9, and 15. 

 Articulate when i^t with fome few. PI. L 

 fig, 14. PI. VI. fig. 4. a. II. b. PI. VII. 

 fig. I, and 5. Mult articulate^ when fet with 

 many or a large number. PL I. fig. 15. 

 PI. VI. fig. 6 and 9. PI. VII. fig. 11. 



10. The furrow^ f Sulcus canaliculus J is 

 the sutter or furrow, when the Shells are 

 clofed that runs along parallel to the 

 hinge. 



1 1. Thejlopes^ (DecUvitas) are the places 

 which flope or flant from the beak down 

 the fides, and generally are flightly flatted, 

 ihallow, or concave. Ph VII. fig. 2, 3. 



^^•^ The 



