PLATE XXXI. 



Zone of Aegoceras Henleyi. 



Fig. 1. Aegoceras Davcei, Sowerby. Lateral view, natural size. Woodwardian 



Museum, Cambridge. Leckenby collection. 



2. — — — Siphonal area, natural size, of the same shell. 



3. — curvicornum, Schloenbach. Siphonal area, natural size. My 



collection. 



4. — — — Lateral view, natural size, same shell. 



Zone of Aegoceras Jamesoni. 



5. — Taylori, Sowerby. Lateral view, natural size. Lyme Regis. In 



my collection. 



6. — — — Siphonal area, showing the double row of 



tubercles on this area. 



7. — — — Front view of the same shell. 



