176 M-. VViixi AM Wood's 0^r^'a//o«J•, f=?t'. 



valve ami three in the other (as is fometlmes the 

 cafe), it muft be confideied as incomplete. 



It was not till I began attentively to examine the hinges 

 of Britifl.1 bivalves, that this fhell appeared to me eflen- 

 tially different from the F. decvjfata. We find it, not 

 uncommonly, on the Sandwich fliore, from half an 

 inch to one and a half or two inches in breadth, and 

 fometimes marked on the outfide (in a zigzag man- 

 ner) with all the ftrength and elegance of a ioreign 

 fpecimen. 



This fpecies is broader, in proportion, than the V. de-' 

 cujfata, and the ftrize are more delicate. 



Y'lg. 1$, iG. Venus crq[fa. (a) The two principal teeth, (b.b.b.b) Re- 

 mote teeth . 

 17, 18. The hinge of the Venus ttndata. (a) The central tooth, 

 (b) Its cavity. 



Tab. XVIII. 



1,2. The hinge of the Area Glycyineris, which in this parti- 

 cular fpecimen is furnifhed with an extraordinary 

 number of teeth. 

 3, 4. Area Nucleus of the natural fize. 

 5, 6. The hinge of the fame magnified. 

 7, 8. The hinge of the PeSlen p'lSlus. 

 9, 10, The hinge of the OJirea edulis. 

 II, 12. The hinge of the Anomla Ephippium. 

 13, 14. The hinge of the Mytilus edulis. (a. a) The fituation of _ 

 the teeth. 



XV. Caia- 



