PLATE XXXV. 
Zotie of Aegoceras Henleyi. 
Fig. 1. Aegoceras acuticostatum, Wright. Lateral view, natural size. Woodwardian 
Museum, Cambridge. ' ' ^ 
2. — — i — Front view, natural size, showing the 
biflexion of the ventral ribs. 
3. ^ — — — Siphon al area of the same shell. 
4. — HETEROGENUM, Young and Bird. Lateral view, natural size. Wood- 
wardian Museum Leckenby 
collection. 
5. — ■ — — Front view of the same shell. 
6. — — — Siphonal area of the same shell, 
showing the sudden enlarge- 
ment of the whorl at the com- 
mencement of the transforma- 
tion scene. Natural size. 
7. — '■ ACUTICOSTATUM, WfigJit. Lobe-line, showing simple ramifications. 
