364 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



Plate I. 



Fig. 1. Shell oiBuccinum undatum. x f 



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



apex, x J- 

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



showing attachment of columellar muscle. 



A 2 

 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. Hoof of pallial cavity with organs of pallial 



complex, x slightly. 

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

 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. 

 Dissection of alimentary canal. Slightly 



reduced. 

 Stomach as seen from digestive gland surface. 



Slightly reduced. 

 Radula with teeth. x 48. 

 Old teeth, x 64. 



Plate III. 



General view of odontophore, radula and 

 muscles from above. Slightly magnified. 



Ventral end of radula with attached ventral 

 retractors. Slightly magnified. 



Fig. 



12. 



Fig. 



13. 



Fig. 



Fig. 



14. 

 15. 



Fig. 



16. 



Fig. 



17. 



