﻿BRITISH FOSSIL CEPHALOPODA. 



Plate Y. 



Fig. 



1. Orthoceras Dupoxti. — From the Lower Ludlow, Ledbury. In the collection 



of Dr. Grindrod. a, the surface magnified. 



2. Ibid. — From the Wenlock Limestone, Dudley. In the British Museum. 



a, the surface magnified. 



3. Orthoceras ibex. — From the Lower Ludlow, Ledbury. In the Museum of 



Practical Geology. Showing a contracting body-chamber, a, the septal 

 surface. 



4. Ibid. — From the Upper Ludlow of Ledbury. In the collection of Dr. Grindrod. 



Showing the body-chamber contracting and then expanding. 



5. Ibid. — From the Upper Ludlow, Benson Knot, Kendal. In the Woodwardian 



Museum. 



6. Orthoceras subaxxulare. — From the Lower Ludlow ? In the British 



Museum, a, diagram to show the imbrication and arrangement of the 

 transverse riblets. 



7. Orthoceras tracheale. — From the Upper Ludlow, Richards Castle. In the 



Ludlow Museum. 



8. Orthoceras ibex. — From the Upper Ludlow, Benson Knot. In the Royal 



College of Science, Dublin. Showing the septa and siphuncle. 



9. Orthoceras texuiaxnulattjm. — From the Lower Ludlow, Aymestry. In 



the Woodwardian Museum. M'Coy's type, a, the surface magnified. 



10. Cyrtoceras extricatdm. — From the Lower Ludlow, Mocktree. In the Ludlow 



Museum. (The drawing is upside down.) 



11. Ibid. — From the same locality and collection. (The drawing also reversed.) 



a, the septal surface. 



