﻿BEITISH FOSSIL CEPHALOPODA. 



Plate XIY. 



Fig. 



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



Museum, a, portion of the surface. 



2. Orthoceras druidii. — From the Bala Beds, Cerrig-y-Druidion. In the Museum 



of Practical Geology. 



3. Orthoceras imbricatum. — From the Upper Ludlow, Ludlow. In the collection 



of G. Cocking, Esq. a, the septal surface, showing traces of vascular marks. 



4. Ibid. — From the Upper Ludlow, Ludlow. In the Museum of Practical 



Geology. Septal surface, showing an excentric siphuncle, a band to the 

 side, and vascular markings, a, side view, showing folds on the surface 

 of the chamber. 



5. Ibid. — From the same locality. In the collection of Gr. Cocking, Esq. 



Showing an oblique band. 



6. Ibid. — From the same locality. In the Museum of Practical Geology. Showing 



a depression. 



7. Orthoceras fretum. — From the Upper Ludlow, Turner's Hill. In the Museum 



of Practical Geology, a, the surface magnified; b, diagram of position of 

 siphuncle and shape of section. 



8. Orthoceras truncatum. — From the Woolhope Shales, Littlehope. In the 



Museum of Practical Geology, a, the septal surface. 



9. Orthoceras semipartitum. — From the Tilestones, Horeb Chapel. In the 



Museum of Practical Geology. 



10. Ibid. — From the same locality and collection. Showing the plate passing to 



the siphuncle. 



11. Ibid. — From the same locality and collection, a, the same magnified, to show 



the pseudo-normal line. 



12. Ibid. — Copy of Phillips's figure for 0, textile. Mem. Geol. Surv. vol. ii. pt. 1. 



