( 69 ) 



d. Marginella. 



Foot very large, part- 

 ly covers the shell by 

 raising the lobes of the 

 mantle ; a retractile 

 trunk, a respiratory 

 tube above the head ; 

 no operculum. 



e. Mitra. 



Eyes on ihe outer base 

 of the tentacula. 



f. Cancellaria. 



6. Buccinum. 



Shells without folds on 

 the columella ; with a 

 notch or short canal in- 

 flected towards the left, 

 for the passage of the re- 

 spiratory tube. Pi. 10, 

 fig. 21. 



a. Buccinum. 



No veil to the head ; 

 a trunk; a respiratory 

 tube formed by the 

 mantle ; operculum 

 horny. PI. 17, fig, 15, 

 16. Pi. 13, fig. 16, 19, 

 20. 



2 Conical tentacula far 

 apart. 



Eyes on the -outer side 

 of the tentacula. 



b. Eburna, Lam. 



c. Dolium, Lam. 



d. Harpa, Lam. 



c. Nassa, Lam. 



Ventral disk en- 

 larged, truncated an- 

 teriorly, prolonged be- 

 yond the head ; a tube 

 above the head formed 

 by the mantle. 



f. Purpura, Brug. (1) 



Foot elliptical ; re- 

 spiratory tube prolong- 

 ed above the head ; 

 operculum cartilagi- 

 nous. PI. 17, fig. 14. 



2 Pointed tentacula. 



Eyes in the middle part 

 of the tentacula. 



Ditto. 



Eyes in the middle of 

 the outer part of the ten- 

 tacula. 



(1) The animal furnishes a matter fit for dying red, which the ancients used, and 

 which is still employed in the north of Europe. 



