2i8 C O N C H O L O G Y. 



which is fo famous in hiftory by the name 

 of the Tyrian purple; becaufe it is imagi- 

 gined., that a Shell of this kind was firft 

 difcovered to afford it : but indeed mofl 

 turbinated Shells yield a like purple liquor. 



This family of Buccina longiroflra con- 

 tains many fpecies very rare and curious. 



Genus 4. Buccina umbilicata. Umbi- 

 licated Whelks, or thofe that have a per- 

 pendicular hollow or navel afide the colu- 

 mella or pillar-lip, on the firft or body 

 whirl. PL IV. fig. 6, the Joppa Whelk. 



This is the pofitive charafter of the 

 genus; and all Buccina or Whelks that 

 have a hollow or navel rank under it, whe- 

 ther guttered, wry-mouthed, or beaked, &c. 



There are very few fpecies of this 

 genus. 



I do not find any author who has formed 

 ^ genus from this fecond character, fo 



that 



