C O N C H O L O G Y. 



valves, and Multivalves. The Univalves 

 he arranges into fifteen families, viz. i. 

 Limpets. 2. Sea Ears. 3. Vermiculi. 4. 

 Nautili. 5. Cochleae Lunares, or round 

 mouthed Snails. 6. Semilunares, or half 

 mouthed Snails. 7. Flat mouthed Snails. 

 8. Buccina. 9. Turbines. 10. Volutes. 11. 

 Rhombi, Cylindars, or Olives. 12. Mu- 

 rices. 13. Purpura. 14. Tuns : and 15. 

 Cowries, 



This author's method is very good ; but, 

 however, there is fome confufion in it ; 

 efpecially in the following families, viz. 

 7. The JBat mouthed Snails. 8. The Buc- 

 cina. 12. The Murices -, and 13. The Pur- 

 puras. Befides, a proper place is wanting 

 for the Paper Nautili, which he very erro- 

 neoufly ranges with the chambered or com- 

 mon pearly Nautilus ; but I ihall refer to 

 further particulars, when I treat of each 

 family refpeftively. 



Gualtierl arranges Shells into five parts, 

 v'li. Part L Land and River Shells, both 



frmpl^ 



