PLATE VI. 



Fig. 



1 . Nautilus largilliertianus ; from the Chalk with siliceous grains of Chardstock, in 



the collection of Mr. Wiest. 



la. Side view. 

 15. Front view. 



2. Nautilus largilliertianus ; a fragment from the Chalk with siliceous grains of 



Chaldon, in the collection of Mr. Morris. 



2a. Side view, with a commencement of undulation on the back. 

 2d. Septum, showing the position of the siphuncle. 



3. Nautilus Fleuriausianus ; from the Chalk with siliceous grains of Chardstock, in 



the collection of Mr. Wiest. 



3fl. Side view. 

 3d. Front view, 



4. Nautilus Fittoni ; from the Chalk with siliceous grains of Chardstock, in the 



collection of Mr. Wiest. 



4a. Side view. 



43. Back view. 



4c. Septum showing the position of the siphuncle. 



