Plate 16. 



Page. 



Fig. 1. Siphonodentalium lobatum Sowerby. 17 mm 89 



2. Siphonodentalium verrilli, new species. Type, 7 mm 91 



3. Siphonodentalium striatinum, new species. Type, 7 mm 90 



4. Siphonodentalium occidentale, new species. Type, 3.15 mm 93 



5. Siphonodentalium tytthum Wsitson. 5.5 mm. Copy of Watson's figures. 91 



6. Siphonodentalium hushi, new species. Type, 5 mm 94 



7. Siphonodentalium, verrilli. Apical detail 91 



8. Siphonodentalium striatinum. Sculptural detail 90 



9. Siphonodentalium lobatum, Sowerby. Apical detail 89 



167 



