274 CONCHOLOGY 



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SECTION XIII. 



I A M now come to Part III. Concha 

 Hiantes^ or Bivalves, vvhofe Shells ne- 

 ver fhut clofe, but are always open or gap- 

 ing in fome part. 



This part conftltutes the thirteenth fa- 

 mily, and conlifts of four genera, to wit, 



Genus i, Tridacn^, or Bafon Conques, 

 Genus 2, Chamae, or Gapers. 

 Genus 3. Solens, or Sheaths : and 

 Genus 4. Pinnae, Sea Wings, or Hams. 



Genus r. Tridaenae, or Bafon Conques. 



Shells of equal valves and diffimilar fides, 



in hinge and appearance like the Heart 



3 Cockles^ 



