Plate 3. 



Page. 



Fig. 1. Dentalium obscurum Dall. Type, 28 mm 32 



2. Dentalium rebeccaense, new species. Type, 13 mm. (juvenile) 31 



3. Dentalium obscurum Dall. Sculptural detail 32 



4. Dentalium carduus Dall . 77 mm 33 



5. Dentalium, carduus Dall. 20 mm. (juvenile) 33 



6. Dentalium gouldii colonense, new subspecies. Type, 35 mm 31 



7. Dentalium carduus Dall. Sculptural detail 33 



154 



