﻿BEITISH FOSSIL CEPHALOPODA. 



Plate XXXI. 



Fig. 



1. Trochoceras giganteum. — From the Lower Ludlow. Locality unknown. In 



the Museum of the Geological Society. Sowerby's type. 



2. Ibid. — From the Lower Ludlow, Leintwardine. In the Museum of Owens 



College, Manchester. Showing the asymmetry and the contracted aperture. 



3. Trochoceras tortuosum. — From the Lower Ludlow, Welchpool. In the 



Museum of the Geological Society. The portion above the dotted line (x) 

 has been reversed and the other side of the fragment drawn, a, the septal 

 surface. 



4. Lituites arietinus. — From the Lower Ludlow, Ledbury. In the collection 



of Dr. Grindrod. a, view of a portion of the front. 



