igi THE WEDGE-SHELL. 



The little southern Wedge-shell is shown in Fig. 

 164. Its name is Donax Califomicus, Conr., Do'-nax 

 Cal-i-for'-ni-cus. It is short and stumpy, 

 cut nearly square off at one end and 

 tapering to a rounded edge at the other. 

 Fig. 164. It varies much in color, sometimes being 

 nearly white, while other specimens are striped with 

 bright tints. Its surface is smooth, though marked 

 with narrow radiations. The edge is finely crenula- 

 ted. Its length is an inch or less. 



Donax flexuosus, Gld., flex-u-o'-sus, likewise a 

 southern species, resembles the foregoing, but the 

 rear part of the shell is not cut off so obtusely. Shell 

 white, usually covered with a light brown epidermis. 

 There are dark colored spots on the interior. 



Cardium qiiadriginarium, Conr., is a rare southern 

 species, resembling Fig. 153, but having about forty 

 delicate ribs. It sometimes grows to a great size. 



