Plate 8. 



Page. 



Fig. 1. Dentaliumamphialum'Wsitson. Type, 50 mm. Copy of Watson's figure. 59 



2. Dentalium bartletti, new species. Type, 42 mm 55 



3. Dentalium callithrix Dall. 23.5 mm. (juvenile) 57 



4. Dentalium callithrix Dall. Type, 24 mm. (juvenile) 57 



5. Dentalium tubulatum, new species. Type, 37 mm 56 



6. Dentalium callithrix Dall. Enlarged sculptural detail 57 



7. Dentalium bartletti. Enlarged sculptural detail 55 



159 



