PLATE XL. 



Zone of Aegoceras Jamesoni. 



Fig. 1. Aegoceras polymorphum, Quenstedt. Lateral view, magnified two diameters. 



In the collection of the Rev. J. E. 

 Cross, F.G.S. 



2. — — — Siphonal area, front view do. 



3. — — — Simple lobe-line of this form do. 



Zone of Aegoceras Hex. 



4. Phtlloceras Loscombi, Sow. Lateral view, natural size. My collection. From 



Charmouth, Dorset. 



5. — — — Front view of siphonal area do. 



