57 



sometimes more convex on one side than on the other, 

 and the striae occasionally running in different direc- 

 tions in each: they are sometimes quite smooth, and 

 others have imbricated scales. The valves in some spe- 

 cies are much more twisted than in others. 



Shell transversely oblong. 

 Tellina radiata Tellina elliptica 



unimaculata 



albinella 



semizonalis 



margaritina 



maculosa 



strigosa 



virgata 



planata 



staurella 



punicea 



crucigera 



depressa 



Spengleri 



pulchella 



rostrata 



fabula 



lati rostra 



tenuis 



sulphurea 



exilis 



foliacea 



donacina 



operculata 



nitida 



rosea 



scalaris 



chloroleuca 



psammotella 



Shell orbicular, or rounded oval. 



Tellfna remies Tellina striatula 

 * sulcata scobinata 



