364 TRA^^SACTIO^'S Liverpool biological society. 



Plate I. 



Fig. 1. Shell oi Bi(cci)iuin uynlatuui. x f 



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



apex. X f 

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



showing attachment of cohimellar muscle. 



X I 

 Fig. 4. Surface view of periostracum. 



Fig, 5. SujDerior surface of operculum. x 1. 



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



Fig. T. 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 i 

 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 



leduced. 

 Fig. ]-\. Stomach as seen from digestive gland surface. 



Slighth^ reduced. 

 Fig. 14. Eadula with teeth. x 48. 

 Fig. 15. Old teeth. x G4. 



Plate III. 



I'ig. ](). General view of odoutopliore, radula and 

 muscles from above. Slightly magnified. 



Fig. IT. Ventral end of radula with attached ventral 

 retractors. Slightly magnified 



