PLATE XXXVII. 



The following species are from different zones. 



Fig. 



2. 

 3. 



10 



11 



1. Aegoceras Maugenesti, cfOrbigng. Lateral view, natural size. My collection 



from the Ibex zone. 



— — — Front view, showing spines do. 

 Arietites nodotianus — Lateral view, natural size. This is General 



Portlock's type specimen of his Am- 

 monites Macdonetti, Dublin Museum of 

 the Geological Survey of Ireland. 



— — — Front view of same, showing keel. 

 Aegoceras pettos, Quenstedt. Lateral view, magnified. From the collection 



of the Rev. Samuel Lucas, F.G.S. 



— — — Siphonal area, showing the deep ribbing. 

 — — Front view of the same fossil. 



gagateum, Young and Bird. Lateral view, natural size. My col- 

 lection. 

 — — Front view, with ribs on ventral area 



of same, natural size. 

 Milleri, Wright. Ventral area, showing the singular shell texture 

 of this species. Collected at Pabba by Pro- 

 fessor A. Geikie, F.R.S. My collection. 



— — — Lateral view of the same, showing the position 



of the lateral tubercles. 



4. 

 5. 



6. 



7. 



9. — 



