PLATE IV. 



Fig. 



1. Nautilus elegans, reduced to two thirds ; a front view of the inner portion of the 



specimen figured Plate III, fig. 3, showing the position of the siphuncle. 



2. Nautilus pseudo-blegans ; from the Grey Chalk near Lewes, in the collection of 



the Geological Society. 



2a. Side view. 



2b. View of one septum, with the opening for the siphuncle. 



