112 



Plate I. 



Fig. 1. Shell of Buccinum undatum. x ± 

 Fig. 2. Section of Buccinum shell, showing septa at 

 apex, x | 



Fig. 3. View of part of columella of 5th whorl, 

 showing attachment of columellar muscle. 



x I 



Fig. 4. Surface view of periostracum. 

 Fig. 5. Superior surface of operculum. x 1. 

 Fig. 6. Longitudinal section of shell, x 40. 

 Fig. 7. General view of animal after removal of shell, 

 x 1. 



Plate II. 



Fig. 8. Roof of pallial cavity with organs of pallial 



complex, x slightly. 

 Fig. 9. Ventral surface of foot (expanded). x A. 

 Fig. 10. Transverse section of pedal groove and gland. 



x 17. 



Fig. 11. Dissection showing cavity into which proboscis 

 sheath is retracted and also rhynchocoel in 

 which proboscis lies. x 1. 



Fig. 12. Dissection of alimentary canal. Slightly 

 reduced. 



Fig. 13. Stomach as seen from digestive gland surface. 



Slightly reduced. 

 Fig. 14. Eadula with teeth. x 48. 

 Fig. 15. Old teeth, x 64. 



Plate III. 



Fig. 16. General view of odontophore, radula and 

 muscles from above. Slightly magnified. 



Fig. 17. Ventral end of radula with attached ventral 

 retractors. Slightly magnified. 



