102 THE ELEMENTS 



dewy mornings, or after a gentle 

 shower of rain. 



BIVALTE. 



Fig. 4th.~- VENUS CHIONE. 

 Shell strong, sub-cord ated, somewhat 

 concentrically wrinkled, margin en- 

 tire, covered with a smooth, glossy, 

 chesnut-coloured epidermis ; some- 

 times a little radiated ; beneath which 

 the shell is of a beautiful pale purple ; 

 apex turned sideways, with a cordi- 

 form depression ; umbo placed nearest 

 one end. Found at Falmouth in Corn- 

 wall. 



Linn. Trans, vol. viii. page 84. 



aa Summit, bb lunule, i anterior 

 slope, k posterior slope, o disk, p 

 margin or limb. 



Fig. 5th.— SOLEN SILIQUA. 

 Shell linear, straight ; in one valve two 

 teeth, and one in the other, with a 

 lateral inclined tooth corresponding 



