SECTION XII. 267 



remarkable fubordinate characters, that it 

 can, with great propriety and eafe, be di- 

 vided into three genera, viz. 



Genus i. Pe£tunculi or Cockles, the 

 Chamae of fome later authors. PL VIL 

 fig. I. 



Genus 2. Cordiformes orHeart Cockles* 

 PI. I. fig. 8, 9. Pi. VI. fig. 8. And 



Genus 3. Truncati or flat-fided Cockles. 

 PI. VI. fig. 12. PI. VII. fig. 10. 



Genus i. Peftunculi or Cockles. Shells 

 convex or flattifh, of a roundifli fliape, 

 and^with fimilar or diffimilar fides ; whofe 

 beaks are not very peaked or prominent, 

 and curve, or turn much upwards towards 

 the hinge; fuch are the flattifli Cockles, 

 .and many others. This genus is numerous. 



Lifter intermixes them with my two 

 following genera, all by the name of Pec- 



tunculi. 



