PLATE II. 



Zone of Arietites Bucklandi. 



"Pig. 1. Arietites Conybeari, Sowerby. Lateral view. Half natural size. My 

 collection. 



2. Front view of the same Ammonite, showing siphonal area and bisulcations, 



in same proportion. 



3. Foliations of the septa magnified. 



This fine type shell was obtained from the Great Western Railway cutting at Saltford 

 near Bath when the line was making. A magnificent specimen of this species, nearly 

 as large as a small carriage wheel, from the same locality, collected by me, is now in the 

 British Museum. 



