DONAX. 



and the shell named Donax complanata belongs to La- 

 marck's Capsa, while we believe the D. plebeia of authors 

 to be a species of Erycina. 



Of fossil species there are very few; Brocchi mentions 

 two, and we possess a small one from Bordeaux^ but we 

 believe they are very scarce. 



Our plate contains representations of four species : 



Fig. 1. Donax Scortum. 



2. cuneata. 



3. Donax Trunculus, Linn. This is the English shell, and agrees perfectly 

 well with the Linnean description, wherefore we retain the name of Trunculus 

 for it. 



4. deltoides. 



Lamarck divides Donax into two sections; those 

 whose edges are entire without crenulation, and those 

 whose edges are crenulated: all the species we have 

 examined are more or less distinctly crenulated. 



