﻿BRITISH FOSSIL CEPHALOPODA. 



Plate XXL 



Fig. 



1. Cyrtoceras llandoveri. — From the Upper Llandovery rocks, Craig-yr- 



Wyddon. In the Woodwardian Museum, a, fragment of the siphuncle cast, 

 showing the subdivision and lineation of the concave elements and the 

 tubercle on the upper half. 



2. Cyrtoceras intermedium. — From the Lower Ludlow, Leintwardine. In the 



Woodwardian Museum. M'Coy's type, a, the outline section. 



3. Cyrtoceras uranus. — From the Lower Ludlow, Ledbury. In the collection 



of Dr. Grindrod. 



4. Cyrtoceras scoticum. — From the Bala Beds, Broughton. In the Museum of 



the Geological Survey, Edinburgh, a, front view of the same, showing the 

 apex and cicatrix. 



5. Cyrtoceras reversum. — From the Lower Ludlow, Ledbury. In the collection 



of Dr. Grindrod. 



6. Trochoceras cornu-arietis.— From the Bala Beds, Sholeshook. In the 



Museum of Practical Geology, a, the reverse side. 



