PLATE XI. 



Nautilus Suciensts (page 97.) 



Figure 1. Side view of the most perfect specimen yet collected. 



" 1 a. Outline of a septum of the same, to show the position of the siplnnicle. 



Nautilus Campbelli, Meek (page 99.) 



Figure 2. Outline of a detached septum of a small specimen. 



" 2 a. Another portion of the same specimen, with some of the loose outer 

 chambers removed, showing the oancellate sculpture of the early 

 whorls, and the projecting, shelly cones surrounding the deep, 

 narrow, umbilical perforation. 



" 2 b. Sculpture of a part of ditto, highly magnified. 



