PLATE VIII. 



Zone of Arietites Bucklandi. 



Fig. 1. Arietites Sauzeanus, tfOrbigny. A large specimen, in my collection ; collected 

 at Bredon, Midland Railway cutting, Gloucestershire. Lateral view, 

 natural size, showing the rib-flexures and tubercles near the outer margin 

 of the siphonal area. Most of the shell preserved. 



2. Front view of the same fossil, showing lobes, keel, and tubercles. 



3. Accurate outline of the foliations of the septa in this species. 



4. Lateral view of a smaller shell, collected at Darlingscott, near Shipton-on-Stour, 



Worcestershire, showing the sharp ribs and tubercles. Natural size. 



5. Lateral view of a small shell from Darlingscott, showing the sharpness of the 



mould. Natural size. The Darlingscott specimens were collected by my 

 friend John Kershaw, Esq., Warwick, and kindly presented to me for 

 this work. 



6. View of the siphonal area of the same. The keel and ribs are more prominent in 



this specimen than usual on the siphonal area. Natural size. 



