PLATE III. 



Zone of Arietites Bucklandi. 



Fig. 1. Arietites bisulcatus, Bruguiere = Arietites multicostatus, Sowerby. 

 Lateral view of a fine typical specimen, showing the foliations of the 

 superior and inferior lateral lobes. Collected at Frethern-on-Severn, 

 Gloucestershire, by John Jones, Esq., and now in the Museum of the 

 School of Art and Science, Gloucester. 



2. View of the siphonal area of the same Ammonite, showing the foliations of 



the siphonal lobes in situ. 



3. An accurate outline of the foliations of the septa, showing the siphonal, 



superior lateral, inferior lateral, and auxiliary lobes. 



