PLATE III. 



Fig. 



1. Nautilus Deslongchampsianus ; from the Grey Chalk near Lewes, in the collection 



of Dr. Mantell. 



la. Side view. 

 Id. Back view. 



2. Nautilus Deslongchampsianus ; a fragment somewhat crushed, with the cross-rib- 



bing well preserved. From the Grey Chalk, near Lewes. 



3. Nautilus elegans ; from the Grey Chalk near Lewes, in the collection of Mr. 



Hudson. 



The smooth part of this specimen has been enclosed in another whorl, which 

 is partially broken away. 



