SECTION XIL 253 



very juft, except that he makes both 

 Shells convex, which is not fo in feveral 

 fpecies. 



Gualtleri, who figures three recent kinds, 

 PI. XCVI. has made a particular genus 

 for them, and calls it Terebratula. He 

 defines them, very erroneoufly, as Shells 

 wnth equal valves, and diffimilar fides, of 

 a peculiar ftruSure, for iuftead of a beak 

 it has a perforation, and alfo has a very 

 fingular articulation or connexion within- 

 fide. The faid author's figures are very 

 good. 



Linnaeus, who has enjoyed the difco- 

 veries of the recent or living Shells, has 

 made them his genus 3 1 4 Anomia?. He has 

 mixed the recent with the foffil kinds, and 

 defines them to be Shells with unequal 

 valves, one valve being flattifh, the other 

 convex, the beak perforated, and the hinge 

 inarticulate or toothlefs. 



How- 



