﻿BRITISH FOSSIL CEPHALOPODA. 



Plate XXIV. 



Fig. 



1. Phragmoceras ventricosum. — From the Lower Ludlow, Aymestry. In the 



Museum of the Geological Society. Sowerby's type, a, diagram of half the 

 aperture in the adult. 



2. Ibid. — From the May Hill Sandstone. In the Woodwardian Museum, a, out- 



line of the aperture. 



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



view. 



4. Poterioceras (?) INTORTUM. — From the Bala Series, Piedmont, Ayrshire. In 



the Museum of Practical Geology. 



5. Phragmoceras prius. — From the Bala Beds of Rhiwlas, Bala. In the Museum 



of Practical Geology. 



6. Poterioceras (?) approximatum. — From Bala Beds, Twll Ddu. In the Museum 



of Practical Geology. 



7. Phragmoceras obliquum. — From the Wenlock Limestone, Dudley. In the 



Woodwardian Museum, a, front view, showing the aperture. 



