﻿BRITISH FOSSIL CEPHALOPODA. 



Plate X. 



Fig. 



1. Orthoceras ludense. — From the Wenlock Beds, Dudley. In the British 



Museum. 



2. Orthoceras mocktreense? — From the Lower Ludlow, Ledbury. In the col- 



lection of Dr. Grindrod. 



3. Orthoceras ludense. — From the Lower Ludlow, Herefordshire. In the British 



Museum. Showing the internal structure. 



4. Ibid.- — From the Lower Ludlow, Ludlow. In the Museum of the Geological 



Society. Showing the aperture. 



5. Ibid. — From the Lower Ludlow, Leintwardine. In the Woodwardian Museum. 



Showing an unsymmetrical siphuncle. 



6. Orthoceras mocktreense ? (young.) — From the Lower Ludlow, Ledbury. In 



the collection of Dr. Grindrod. 



7. Orthoceras ludense. — From the Wenlock Limestone, Ledbury. In the col- 



lection of Dr. Grindrod. 



8. Orthoceras filosum. — From the Lower Ludlow, Mocktree. In the Ludlow 



Museum, a, a section through the shell to show the uprightness of the 

 riblets. 



9. Ibid. — From the Lower Ludlow, Leintwardine. In the Museum of Practical 



Geology. 



