valve a ilngle broad crenated tooth, with two lateral la- 

 minae in one valve and one in the oppofite, locking into 

 each other. 



This fliell is not very unlike the ovalis in the form and 

 ftrufture of the teeth, but very effentially in fnape and 

 fize. Do6lor Pui.teney in his Catalogue of Dorfetjliire 

 fliells, does not confider the Myn Pitloriim of Linn^us 

 as an Englxjli fliell ; and at our requeft favoured us with 

 foreio-n fpecimens of what is confidered the Linncean 

 Piclorum, which were in every refpett like our (liell. It 

 feems that Doftor Solander confidered this as the true 

 Piclorum, but not found in England; and named the 

 ovalis as a diflinft fpecies in the Portland Mufeum. We 

 believe this is a rare, or at leafl; a very local fliell in 

 England; it is however not uncommon in the river Ken- 

 net, above the town of Newbury in BerkJJiire, where we 

 difcovered it, but have never found it in any other place. 

 It is common in HolLind and many other parts of the 

 Continent, and is generally ufed by painters for holding 

 their colours, whence the name. 



The ovalis, w^hich is common in mofl parts of this 

 kingdom, is ufed for the fam^ purpofe, but greatly ex- 

 ceeds the PiHorum in fize, which feldom is more than an 

 incli fmm tlic hing" to the oppofite margin, and an inch 

 and three-quarters wide. 



Cardium 



