PLATE CLXVIL 



riety of that shell. The varieties of N. Canrena, enumerated by 

 Gmelin, amount to twenty-five, neither of which accords exactly with 

 our shell, and that writer describes them only as natives of India, 

 Africa, and America, but it is not unlikely it may be also an European 

 shell. 



Our specimens are from Weymouth. 



