CONCHIFERA. 



feri^m the tanks. Sub-genera. Qryphaa, 

 Lamarck. G. incurva, Sby (section) fig. < 

 178. Tree, or very slightly attached ; left 

 valve with a prominent, incurved umbo ; 

 right valve small, concave. Fossil, 30 sp. 

 Lias Chalk. Europe, India. 



Exogyra, Sby. E. conica, PI. XVI. 

 fig. 2. Shell chama- shaped, attached by 



the left valve ; umbones sub-spiral, turned Fig. 178. Grypha 



to the posterior side (i. e. reversed); right valve opercular. Fossil, 40 sp. 

 L. Oolite Chalk. U. States ; Europe. 



ANOMIA, L. 



