Plate 6. 



Fig. 1. Dentalium pseudohexagonum Ihering. 



2. Dentalium pseudohexagonum Ihering. 



3. Dentalium pseudohexagonum Ihering. 



4. Dentalium disparile Orbigny. 20 mm 



5. Dentalium disparile Orl^igny. 



6. Dentalium disparile Orbigny. 



7. Dentalium, disparile Orbigny. 



8. Dentalium disparile Orbigny. 



20 mm 



Posterior section. 

 Sculptural detail . 



.32 mm 



25.5 mm 



Posterior section. 

 Anterior section . 



Pav,". 

 46 

 46 



46 

 47 

 47 

 47 

 47 

 47 



157 



