﻿BRITISH FOSSIL CEPHALOPODA. 



Plate XV. 

 Fig. 



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



of Dr. Grindrod. a, the upper end, showing the distortion and unsym- 

 metrical siphuncle. 



2. Ibid. — From the Lower Ludlow, near Aymestry. In the Museum of the 



Geological Society. End of the septal surface. 



3. Orthoceras baculiporme. — From the Upper Ludlow, Brigsteer. In the 



Woodwardian Museum, a, the septal end and the outline at the base of the 

 body-chamber, showing the compression of the former : the bottom part is- 

 Salter's type. 



4. Orthoceras gregarium. — From the Lower Ludlow, Ludlow. In the Museum 



of the Geological Society. Part of Sowerby's type, a, the septal surface. 



5. Ibid. — From the Lower Ludlow, Presteign. In the Museum of Practical 



Geology. Part of a group. 



6. Orthoceras mocktreense. — From the Lower Ludlow, Mocktree. In the 



Museum of the Geological Society, a, a bead of the siphuncle. 



7. Orthoceras (Actinoceras) cochleatdm. — From the Lower Silurian, Guerny- 



fydd. In the British Museum. 



8. Ibid. — From the Upper Llandovery, Craig-yr-wyddon. In the Museum of 



Practical Geology. Interior of a siphuncular bead. 



9. Orthoceras omissum. —From the Upper Ludlow, Benson Knot. In the 



Museum of Practical Geology, a, the septal surface. 



