I90 C O N C H O L O G Y. 



them, Rhombi five Strombi Cylindracei, 

 Lib. iv, Seft. x. Part i, c. i &5. R\lm- 

 phius forms a Genus of them he calls 

 Cylindri. Argenville makes them his 

 eleventh family, and names them Rhom- 

 bus, Cylindrus, vel Olea. Davila places 

 them as two Genera of Volutes, viz. as 

 the fecoiid genus or cylindrical Volutes or 

 Rouleaux, and as the third genus or den- 

 tated Volutes or Olives : and Meufchen, 

 whofe feventeenth genus they are, alfo 

 calls them Cylindri five Dadlili. 



Gualtieri names them Cochleas Cylin- 

 droideas, and places them the next Genus 

 after the Volutes, to wit. Genus 2. of 

 feftion I. of clafs i. of the third part ; 

 and Linnaeus ranks them in his Genus of 

 Voluta, by the name of' Cylindroideas. 



This family I fhall divide Into two ge- 

 nera, viz. 



Genus 



