Notes on Fossils from the Falkland Islands. 257 



indistinct radial markings, and in no case is the central tube 

 well seen. The geological age of this slab cannot be inferred 

 from the fossils, for Crinoid stems similar to these might 

 occur in beds of almost any age. 



Explanation of Plate X. 



The original specimens are from Port Louis South, Falkland 

 Islands, and being in the condition of casts only, impressions 

 in wax have been made, from which photographs have been 

 taken, and these reproduced by collotype process. 



All the figures are natural size. 



Spirifera antarctica, Morris and Sharpe. 



Fig. 1. Dorsal valve, hollow cast of exterior, coarse form. 

 ,, 2. ,, exterior of coarse form. 



,, 3. Ventral valve, large specimen. 

 ,, 4. ,, narrow sulcus. 



,, 5. Hinge-area of large specimen. 

 ,, 6. Associated examples of dorsal and ventral valves, and a large 



hinge-area. 

 ,, 7. Ventral valve, interior and hinge-area. 

 ,, 8. ,, exterior. 



„ 9. 

 ,, 10. Dorsal valve of very perfect specimen, showing external 



ornamentation. 



Leptocoelia flahcUites, Conrad. 



Fig. 11. Rounded form, flattened valve and hinge-area. 

 ,,12. ,, inflated valve. 



„ 13. Wide form. 



Cryptonella Baini, Sharpe, 



Fig. 15. Long oval form. 

 ,, 16. Broad form. 



