﻿BRITISH FOSSIL CEPHALOPODA. 



Plate XIII. 

 Fig. 



1. Orthoceras sericeum. — From the Upper Tremadoc, Garth. In the Museum 



of Owens College, Manchester. 



2. Ibid. — From the same locality. In the Woodwardian Museum. One of 



Salter's types. 



3. Cyrtoceras eortiusgulum. — From the Lower Ludlow, Ledbury. In the 



Museum of Practical Geology. 



4. Orthoceras prim^evum. — From the Wenlock Shale, Nantglyn. In the 



Museum of Practical Geology. Possibly Forbes's type. 



5. Orthoceras pictum. — From the Bala Shales, Bala. In the Museum of Practical 



Geology. 

 5 bis. Ibid. — From the same locality and collection. Showing the bands of colour. 



6. Orthoceras Grayi. — From the Wenlock Limestone, Dudley. In the British 



Museum. 



7. Orthoceras elongatocinctum. — From the Bala Beds, Desertcreat. In the 



Museum of Practical Geology. 



8. Ibid, (young.) — From the Bala Limestone, Dent. In the Woodwardian Museum, 



where it has been called 0. conularia. a, the surface magnified. 



9. Orthoceras undulocinctum. — From the Upper Ludlow, Ledbury. In the 



Museum of Practical Geology. 

 1.0. Orthoceras vagans. — From Bala ash, Bala. In the Museum of Practical 

 Geology. 



11. Ibid. — From the same locality and collection. Showing the apex. 



12. Ibid. — From the Lower Llandeilo, Shelve. In the Museum of Practical Geology. 



Showing grooves on the surface. 



