Mr. William VVood^s Ob/efvat'wnsy &c. 



.i:j 



for any thing I know to the contrary, exhibit peculiarities in the 

 formation of their hinges, not to be found in this paper. Perhaps 

 what is already (iniihed may excite fome more able member of 

 this Society, whofe cabinet is more extenfivc, to complete the 

 fubjedt. 



I am indebted to the accurate pencil of my friend Mr. Henry 

 Boys for the So/en pellucidus^ Tellina bimaculatciy Venus Chiont'y and 

 Venus undata. My acknowledgments muft likcwife be made to his 

 moft rcfpeclablc Either, William Boys, Efq. for the ready accefs 

 which I have at all times had to his collection. 



In the courfe of the following remarks, it will be noticed, that 

 fcveral fhells are totally neglefted, which are too common to be 

 wanting even in a very confined collection. To account for this, 

 it will be neceflfary to mention all the fliells belonging to the Bri- 

 tifti feries of bivalves which have not been infeited, and to give a 

 fufficient reafon for their omiflion. 



Of the genus Mya^ all have been figured, except the M dubla 

 of Mr. Pennant, which at prefent I have not in my colleclion. 



Of the Solenes^ I have neither the Legumen nor Cultcllus. But 

 their lofs is of little confequence, as the teeth Q>i the former (ac- 

 cording to Mr. Pennant) exadly refemble thofe of the S. pcllucidus ; 

 whilft the latter, having a fmgle tooth on both fides of the hinge, 

 will probably not differ materially from the Vagina, The hinge of 

 the S, Enjis agrees exa6tly with that of the Siliqua. 



Among the l^eUitK^^ the 'T.fragUis is unknown to me. The T.tri- 

 fafciatay cornubienjis^ and donacina^ are wanting, and the hinge of 

 the Fabula is like t\\t planaia. 



There is too great a fimilarity in the hingts of the fpecies be- ' 

 longing to the genus Cardium^ to make more than one figure ne- 

 ■cefTary, 



Excepting the two lateral teeth of the Ma^ra follda, no effential 



X 2 difTcrcacc 



