PLATE XVI. 



Zone of Aegoceras anyulatum. 



Fig. 1. Aegocekas Liassicum, (TOrhigny. Side view, natural size. Lower Lias, 



Redcar, Yorkshire. My collection. 

 Procured at Whitby. 

 2. — — — Siphonal area of the same fossil to show 



the absence of the ribs in this region . 

 This specimen resembles two large examples of this species contained in the 

 d^Orbignian type collection in the " Jardin des Plantes," Paris. 



