BIVALVES ARC A. 55 



Familv 4. — Shell subcordate. 



Scientific Name. Locality. Common Name. 



Laevigata Nicobar Isles Smooth Ark • 



Pella • • Meditertanean, Spain • • • Brittle do • 



Antiquata E. & W. Indies, Africa • • Antiquated- do • 



Granosa China, East Indies Grained • • • do • 



Rhombea E. & W. Indies, Brazil ■ ■ Rhomboid- do . 



Senilis Guinea Rugose do ■ 



Family 3. — Gaping. 



Complanata Guinea, Madagascar • • • • Compressed do 



Barbata Mediterranean, Red Sea^ Bearded do 



Nivea Red Sea White do 



Caucellata Curacoa Cancellated do 



Family Q.-'-With an ear-shaped appendage in the interior of each 

 valve. 



Concamerata • • • Nicobar Isles Chambered do • • 



Division II. — With the teeth of the hinge in a curved line. 



Family 1. — Subcordate, 



Campechcnsis • - • Campeachy, Carolina • • • • Campeachy do 



E<^uilatera West Indies Equilateral do 



Angulosa W. Indies, Brazil, Africa Angular- •• do 



Family 2. — Suborbicular, margins crenated or plaited. 



Pectuncuius South America, Red Sea- Mottled ••• do 



Pectinata West Indies Pecten do 



Decussata East & West Indies Decussated do 



