TELLINIDES. 



TESTA transversa, subsequivalvis, inseqiiilate- 

 ralis, planulata, latere antico plerumqiie 

 rotundato, postico subrostrato, anguloso; den- 

 tibus cardinalibus in utraque valva duobus; 

 dente lateral! in altera valva, postico, prope 

 cardinalibus proximfe admoto: impressionibiis 

 muscularibus duabus, distantibus ; impressione 

 7niiseulari pallii sinu maximo. 



Aftkr the observations we have made under Tellina, we 

 need here only add that the number of shells that may be 

 arranged under Lamarck's Tellinides is rather considera- 

 ble, although Lamarck has mentioned only one. They 

 are found in the same situations as the TeUincB, 



Shell transverse, nearly equivalve, inequilateral, 

 flattened, anterior side generally rounded, posterior some- 

 what beaked and angular: two cardinal teeth in each 

 valve, and a single lateral tooth in one valve closely 

 approximated to the cardinal teeth: muscular impressions 

 two, distant: that of the mantle having a very large 

 &inus. 



