PLATE XXXVII. 
The following species are from different zones. 
Fig, 1. Aegoceras Maugenesti, (/'Of(5/^«y. Lateral view, natural size. My collection 
from the Ibex zone. 
2. — — • — Front view, showing spines do. 
3. Arietites nodotianus — Lateral view, natural size. This is General 
Portlock's type specimen of his Am- 
monites Macdonelli, Dublin Museum of 
the Geological Survey of Ireland. 
4. — — — Front view of same, showing keel. 
5. Aegoceras pettos, Quenstedt. Lateral view, magnified. From the collection 
of the Rev. Samuel Lucas, F.G.S. 
6. — — — Siphonal area, showing the deep ribbing. 
7. — — — Front view of the same fossil. 
8. — gagateum, Young and Bird. Lateral view, natural size. My col- 
lection. 
. 9. — ■ — — Front view, with ribs on ventral area 
of same, natural size. 
10. — MiLLERi, Wright. Ventral area, showing the singular shell texture 
of this species. Collected at Pabba by Pro- 
fessor A. Geikie, F.R.S. Mv collection. 
11. — — — Lateral view of the same, showing the position 
of the lateral tubercles. 
