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TABULA SYNOPTICA TESTACEORUM. 1. Univalvia. 

 'i'ertaceous Animals rank under Three general Divifions ; viz. I. Univalves. II. Bivalves. III. Multivalves. 

 Division I. UNIVALVES have Four Orders or Subdivifions. I. Simple. 11. Chambered. III. Revolved ; and IV. Turbinated, or Spiral. 

 ORDER I. Simple, or no-wife Spiral. ORDER II. Polythalamia, or Chambered. 



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