﻿BRITISH FOSSIL CEPHALOPODA. 



Plate XL 



Fig. 



1. Orthoceras pomeroense. — From the Bala Shales, Desertcreat. In the Museum 



of Practical Geology. 



2. Orthoceras pendens. — From the Bala Beds, Broughton. In the Museum of 



the Geological Survey of Scotland. «, the septal surface of the same. 



3. Orthoceras mocktreense ? — From the Lower Ludlow, Mocktree. In the 



Museum of Practical Geology. 



4. Orthoceras recticinctum. — From the Upper Ludlow, Ludlow. In the Ludlow 



Museum. 



5. Orthoceras pendens.— From the Bala Beds, Broughton. In the Museum of 



the Geological Survey of Scotland. Showing the ornaments. 



6. Orthoceras Saturni. — From the Lower Ludlow, Leintwardine. In the 



Museum of Practical Geology, a, the surface magnified. 



7. Orthoceras reversum. — In the Museum of Practical Geology. Horizon 



unknown, but the matrix looks like the Ludlow Mudstones. 



8. Orthoceras subundulatum. — From the Wenlock Shale, Barrington. In the 



Museum of Practical Geology. 



9. Ibid. — From the same locality and collection. 



10. Ibid.— From the Wenlock Shale, Builtb. In the same collection. A flattened 

 surface, the appearance of which may be due to pressure. 



