SCISSURELLA. 



each other at the upper part on the left side ; peristome 

 sharp-edged; an oblong foramen near the upper part of the 

 right lip^ following the growth of the volutions and placed 

 nearly parallel with the suture, and forming a sort of keel 

 upon the back of the shell ; no canal. 



Four species are described by D'Orbigny, two of 

 which are recent from the coast of the Mediterranean, 

 and two found in fossil sand from Castel-Arquato ; we 

 have met with several specimens in the Calcaire grossier 

 of Grignon^ and the Rev. Dr. Fleming has described a 

 recent species under the appellation of Sc, crispa, which 

 he found in shell sand from Noss, Zetland^ after a storm. 



