PLATE XXII B. 
Zone of Amalti 
Pig. 1. Arietites Collenottii, d'Orhigny. 
2. — — — 
3. — — — 
'•s oxynotus. 
Side view, natural size, Woodwardian 
Museum, Cambridge. The lateral lobes 
with their numerous digitations, and 
the saddles with their lobules, are well 
shown in situ in this specimen, the 
largest that has been found. 
Front view of same shell showing the 
sagittate aperture. 
Siphonal area, natural size, showing the 
form of the siphonal lobes filling in the 
sulci. 
