SECTION XII. 257 



a tube, from which particular they have 

 alfo obtained the name of Terebratid^. 

 The hinge is inarticulate or toothlefs, and 

 they have ahvays a remarkable interior 

 ftrudure. PI, VI. fig. 3. ^. 



However, by what obfervations can be 

 made, fome of the foffil kinds have an evi- 

 dent multarticulate, or many-toothed hinge. 

 PI. VI. fig. 10. 



I am therefore led to conclude, that the 

 valves of the Anomise are connefted toge- 

 ther in two ways, inftead of being only in- 

 [ articulate, viz. i. By an inartilate hinge ; 

 and 2. "Qy a m.ultarticulate hinge. 



The firft fet have no teeth or joints on 

 the hinge; but the fm.aller or upper valve 

 is always indented into a wide finus, or 

 opening of the larger or under valve, in 

 which it plays like a joint, when the exi- 

 gencies of the animal requires opening or 

 ihutting. PI. VI. fig. 3. a. 



S The 



