156 Mr. William Wood's 01 fei vat ions on the 



difference is to he perceived between the hinge of that fliell and of 

 the M. Intrana. I have therefore omitted it, in order that the 

 number of iigures might not be unnecelTarily increafed. 



Of the two fpecies of Donax, defcribed by Britilh conch ologifts, 

 the Trunctilus only is in my poffefTion ; but it is more than probable, 

 from the refemblance thefe two ihells bear to each other, that their 

 hinges are not very diffimilar. 



I have never feen the Fenus de fi or at a ^^^{cvihQd and figured by Mr. 

 Pennant in the Britijh Z'^ology, I'he V. Jtnuofa and cvata are not 

 among my ftiells j and the hinge of the V. rotundata is too like the 

 decu[faia to need a defcription. The hinge of the V. borealts will be 

 found, upon comparifon, to refemble exa6ny that of the MaSira 

 alba ; therefore it would be placed with more propriety in that 

 genus. The Z)t?«^,v /r//j ought at the fame time to be removed into 

 the third divifion of the g?nus Fenus, where the contour of the ("hell, 

 as well as the formation of the hinge, will point out its p oper 

 fituation. 



In the genus Area, it was thought unnecefTary to give a figure 

 of the laP.ea, after exhibiting the flriking difference between the 

 hin2;e of the A- Nucleus and Glycymeris. 



Of the geuus Pfi^w, OJirea, Anotnia, and Mytilus^ it is fufHcient 

 to fay, that a fpecimen has been given from each, as the fpecies are, 

 for the mod part, deftitute of tee.h, and the Ihells merely united by- 

 cartilage. 



MYA. 



ti'uncata. Linn. Syft. Nat, ed, Gmel I. p, 3217. Penn. Br, ZooL 



No, 14. /. 41 f. 14. DaCofi, Br, Conch, p. 233 /. 16. 



/, I. I. — Ehm. Conch, t. 7./ 16. Lift. Conch, /. 428. 



/. 269.—//^. An, Ang, t. 5. / 36. Gaulh left, t. 91. 



f, D, Chemn, Conch, 6. t. i. f, i , z. 



Tab, 



8 



