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XI. On a Species of TelUna, not defcribed by Linnceus. 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 

 Linnaeus, nor has it ever been noticed by any Englifli writer on 

 Conchology. A figuie, however, of this fhell occurs in Gualtieri's 

 Index lejiarum Conchy Honim {tab. 7, jig. C C) ; but it has been re- 

 ferred to by ProfelTor Gmelin, in his edition of the Syjlema Naturae 

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

 latter in fhape, which Linnsus confidered as one of the moft cer- 

 tain criteria whereby fpecies are to be diftinguilhed. Gualtieri 

 mentions the fhell to which I allude as" Mufculus Jiuviatilis,Jlriatus, 

 fubflavus^pellucidus'^'' which is a very vague and imperfe6l dcfcrip- 

 tion, and by no means fufhcient to fhew in what refpedt it differs 

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

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

 (37, 38), 1 hope it may be judged not inaptly defcribed as follows, viz. 



Tellina (rivalis) tefta oblique fubovata tranfverfim fulcata cornei 



coloris. 

 Habitat in aquis dulcibus. 



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



cula^ 



