Plate 7. 



Fag«. 



Fig. 1. Dentalium ceratum flavum, new subspecies. Type, 26.5 mm 51 



2. Dentalium ceratum ceratum Dall. Type, 30 mm 50 



3. Dentalium ceratum tenax, new subspecies. Type, 19 mm 52 



4. Dentalium ceratum Dall. Sculptural detail of apical portion 49 



5. Dentalium ceratum Dall. Sculptural detail of median portion 49 



6. Dentalium ceratum Dall. Sculptural detail of anterior portion 49 



7. Dentalium ceratum Dall . Apical section 49 



8. Dentalium taphrium Dall. Type, 17 mm 53 



158 



