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XI. On a Species of Tellina, not defer ibed by Linnaeus. By William- 

 George Maton, A, B. F. L. S. 



Read December 2, 1794. 



A SPECIES of Tellina which I have lately found, does not ap- 

 pear to have been defcribed, and was probably never feen by 

 Linnseus, nor has it ever been noticed by any Engliih writer on 

 Conchology.. A figure, however, of this (hell occurs in Gualtieri's 

 Index T eft arum Conchyliorum (tab, 7, fig. C C) ; but it has been re» 

 ferred to by ProfefTor Gmelin, in his edition of the Syjlema Naturce 

 of Linnaeus, for Tellina cornea, though it evidently differs from the 

 latter in fhape, which Linnseus confidered as one of the mod cer- 

 tain criteria whereby fpecies are to be diftinguifhed. Gualtieri 

 mentions the (hell to which I allude as " Mufculus fiuviatilis,Jlriatus, 

 fubflavusy pellucidus ;" which is a very vague and imperfect defcrip- 

 tion, and by no means fufficient to fhew in what refpect it differs 

 from T. cornea. From a view of the fpecimens which I have the 

 honour to prefent to the Linnsean Society, and of the figures 

 (37, 38), I hope it may be judged not inaptly defcribed as follows, viz. 



Tellina (rivalis) tefla oblique fubovata tranfverfim fulcata cornei 



colons. 

 Habitat in aquis dulcibus. 



Tefta magnitudine pifi, rudis, fulcis latioribus, anterius planiuf- 



cula* 



