240 CONCHOLOGY. 



intelligible and eafy, as alfo decent ; for 1 

 hold in great deteftation the obfcene terms 

 made ufe of by the Linnean School* Syfl"* 

 Kat. p* 1069, 1070J &c. 



The terms or names are as follow : 



1. The fummtt fApex) is the part where- 

 on the teeth, joints, or properly the 

 hinges are placed* PI. Vll. fig. i, a a, 



2. 'The beaks (Umbones) are the peaked ends 

 of the Shell, which mod generally ftand 

 behind thtfummit^ or that part which an-- 

 fwers to it. PI. VII. fig. i, 2, 3. bhbb, 



3. The margins or borders {inargines^ 

 are the edges or contour of the Shell, pro- 

 duced from the beak or hinge on either 

 fide. PL VII. fig. I* c c c c. 



4. The furfaces^ ffuperjiciesj concavitas 

 & convexltas Concharum ; the convex 

 expreffes the exterior or convex fide of the 

 Shells, and the concave, the infide. 



7 c. The 



