78 THE ELEMENTS 



nera : Strombus, Pterocera, and Ros- 

 tellaria. 



In Turton's Linne fifty-five species 

 of Strombi are described ; and only 

 two have been found to inhabit the 

 British seas. 



Genus 26th.— MUREX. Animal a 

 Limax ; shell univalve, spiral, rough, 

 with membraneous sutures ; aperture 

 oval, ending in an entire straight or 

 slightly ascending canal. Linn. Syst. 

 325. Plate 8th, fig. 26th. 



Linne divides the Murices into six 

 families : *Spinosi, spinous, with a 

 produced beak; **Frondosi Suturis, 

 sutures expanding into crisped folia- 

 tions ; beak abbreviated ; *** Ventri- 

 cose, with thick protuberant rounded 

 sutures ; ****Ecaudati, more or less 

 spinous, and without manifest beak ; 

 *****Caudigeri, with a long, straight, 

 subulate, closed beak, and unarmed 

 with spines ; ******Turriti, tapering, 

 subulate, with a very short beak. 



