PLATE II. 



Fig. 



1. Nautilus l^vigatus ; from the Chalk with siUceous grains of Chardstock, in the 



collection of Mr. Wiest. 



la. Side view. 

 lb. Front view. 



2. Nautilus l^vigatus, young ; from the Chloritic Marl of Bonchurch, in the col- 



lection of Mr. Saxby. 



2a. Side view. 



26. Front view, showing the position of the siphuncle, 



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



collection of Mr. Wiest. 



3a, Front view. 

 SI/. Side view. 



4. Nautilus expansus, young ; from the Chalk, with siliceous grains of Chardstock, 



in the collection of Mr. Weist. 



4a. Side view. 



43. Front view. 



4c. Portion magnified, showing the cross striation. 



5. Nautilus expansus ; view of one septum, showing the position of the siphuncle ; 



from Mr. Bunbury's collection. 



