PLATE V. 



Page. 

 Gryph^a vesicularis Lamarck 36 



Fig. 1. Upper view of a, large flat spcciraeu of the form known under the generic name 

 Piicnodonta. 



2. Lateral view of tbc specimen shown on Plate IV, Fig. 3, showing the convexity 



and the depth of the lateral sinuosity. 



3. Lateral view of the specimen, PI. Ill, Fig. 16. 



278 



