BRITISH FOSSILS. 



and passes from beneath the anus over the cheeks. The base is 

 flattened, and, except on the ambulacral spaces, is strongly tuber- 

 culated. The mouth is very small and far forward. 



The largest specimen which I have seen measures ^-^ths of an 

 inch in length of base ; -j-^ths in breadth ; -f^ihs in height at the 

 anal truncation, and when perfect must have been ths in height 

 at the anteal sulcus. 



Locality and Geological Position. In the Chalk with Flints of 

 Kent and Norfolk. 



Description of the Plate. 



CAKDIASTEK EXCENTRICUS. Eigs. 1-18. 



Eigs. 1. 2. and 3. Different views of a silicified specimen in tlie cabinet of Mr. Bower- 

 bank. 



Eigs. 4. 5. and 6. Outlines of a large flint cast, very perfect, in the collection of Mr. Rose. 

 This is the original of the figure in the Geology of Norfolk. 



Eig. 7. Anterior extremity of a large specimen in which the test is preserved, in the 

 cabinet of Mr. Rose. 



Eigs. 8. 9. Half grown example, somewhat crushed, in the cabinet of Mr. Wetherell. 

 Eigs. 10. 11. and 12. Anterior and posterior views and side profile of small specimen 

 in Mr. Rose's collection. 



Eig. 13. Outline of a young example in Mr, Rose's cabinet. A flint cast. 



Eigs. 14. and 15. Details of the test and of the apical disk as exhibited on flint casts. 



Eig. 16. Outline of the under surface. 



Eig. 17. Tubercles and granules from a specimen in the Museum of Practical 

 Geology. 



Eig. 18. Cheeks, with a part of the fasciole. 



CARDIASTER ROSTRATUS. Eigs. 19-24. 



Eigs. 19. 20. and 21. Different views of a specimen from the chalk near Plumstead, 

 presented by Mr. Cockburn to the Museum of Practical Geology. 



Eigs. 22. and 23. Outline partly restored of a large specimen from Norfolk in Mr. Rose's 

 collection. 



Eig. 24. Cheeks and part of fasciole. 



Edward Forbes. 



October, 1S52. 



