PLATE LXIX. 



Zone of Aegoceras Henleyi. 

 Fig. 1. Lytoceras lineatum. Side, natural size. My collection. 



Zone of Aegoceras Ibeoo. 



2. Aegoceras Valdani, oVOrUgny. Side view, natural size. My collection. 



3. — — — Back view, do. 



4. — — — Lobe-line, magnified. 



Zone of Aegoceras Jamesoni. 



5. — pettos, Quenstedt. Side view, natural size. My collection. 



6. — ■ — ■ — Siphonal area and lobe-line, do. 



