.88 



It has alfo occurred to us in other places, particularly 



in the water-courfes in the meadows near Wareham in Bor- 



feffJiire ; but by no means fo plentiful as the C. cortieum. 



There can be no doubt but this is the Tellina amnica of 

 Mxj'LI.er, which he defciibes very well in the following 

 words, tejla fubcordiformis tranfverjim fulcata, ^unbone 

 obtujo. It is rather unfortunate that the name of Tellina 

 rivalis has of late been adopted for this fliell, as it is likely 

 again to produce confufion, Muller having previoufly 

 given that name to the T. cornea of Linn^us. 



It is indeed at once diftinguiflied from that fliell by its 

 more oval fliape, ftrongly fulcated appearance, and by 

 the umbo not being in the centre : the hinge is alfo much 

 flronger, and the teeth though fomewhat fimilar, are much 

 larger and more confpicuous. 



Our late worthy friend Doftor Pulteney, does not 

 feem to have fufficiently defined the diflinflion in his Car 

 dium amnicinn, to make us confider it other than a variety 

 of the C. corneum. 



A minute fhell not above a line in length, fimilar to this 

 in fliape, but fomewhat more cordiform, and tumid, and 

 with teeth as (Irong in proportion, is very common in al- 

 moft all the waters inhabited by either of the two pre- 

 ceding fpecies ; and frequently plentiful in the mud or 

 {ediment of rivulets, ponds, and even ditches where none 

 of a fuperior fize are found ; but v/e cannot determine 



whether 



