PLATE XLVI. 



Da Costa Obs. — Mr. Wallis, in his History of Northumberland, 

 p. 396. No. 9. notes a sort of this shell he calls the Orange and 

 White Solen, found in Budle Sands with this common sort, and in 

 all respects like it, except in colour, which is deep orange and 

 white in transverse fillets, in alternate variegations. Quere, if <X 

 distinct species, or only a variety ? 



d 2 



