﻿BRITISH FOSSIL CEPHALOPODA. 



Plate XXVI. 

 Fig. 



1. Phragmoceras arcuatum. — From the Wenlock Limestone, Dudley. In the 



Museum of Practical Geology, a, front view, showing the aperture. 



2. Ibid. — From the Lower Ludlow, Ledbury. In the collection of Dr. Grindrod. 



Part of the specimen, a, the septal surface. 



3. Phragmoceras externum. — From the Lower Ludlow, Ledbury. In the collec- 



tion of Dr. Grindrod. a, the septal surface. 



4. Gomphoceras corona. — From the Wenlock Limestone, Ledbury. In the collec- 



tion of Dr. Grindrod. a, front view, showing the aperture. 



5. Ibid. — From the same locality and collection. A small example, which is 



supposed to have not yet formed its contracted aperture, a, the septal 

 surface. 



6. Gomphoceras ^equale. — From the Wenlock Limestone, Dudley. In the Wood- 



wardian Museum, a, outline of the aperture ; b, the septal surface. 



7. Gomphoceras corona. — From the Wenlock Limestone, Ledbury. In the collec- 



tion of Dr. Grindrod. Seen from the dorsal side. 



8. Ascoceras vermiforme. — From the Lower Ludlow, Ledbury. In the collec- 



tion of Dr. Grindrod. 



9. Ascoceras Barrandei. — From the Upper Ludlow, Stansbatch. In the 



Museum of Practical Geology. Salter's type. 

 10. Ascoceras bohemicum. — From the Upper Ludlow, Whitecliff. In the Museum 

 of Practical Geology. 1 a, part of the uppermost sigmoid septal surface; b, the 

 ordinary septal surface. 



1 The apparently most convex side corresponds to the right-hand side of fig. 9. 



