BRITISH FOSSILS. 



3 



is a very insufficient description. Dr. Mantell, who was the first 

 to notice it in England, referred it with a doubt to the Spatangus 

 prunella, at the suggestion of the late Mr. Konig. With the latter 

 fossil, however, which is a very curious species of Hemiaster well 

 known at Maestricht, it has no near affinity. Roemer has given a 

 good figure of the true type under the name of Ananchytes 

 analis. Its aspect and the arrangement of its amBulacral plates 

 are strikingly those of an Ananchytes, whilst the position of its 

 vent is that of an Holaster. I regard it as a link between the 

 groups, both being sections only of one natural genus. In some 

 examples of this fossil the minute granules towards the side ma^rgins 

 show a tendency to collect into a fasciole, a feature indicative of 

 an affinity with Cardiaster. 



Locality and Geological Position. In the Upper Chalk of Kent^ 

 Sussex, and other English counties. 



Explanation of Plate VITI. 



Eigs. 1. to 6. Various views of adult examples. 

 Eigs. 7. and 8. Elint casts. 

 Fig. 9. A half grown example. 

 Figs. 10. to 13, young specimens. 



Fig. 14. Ambulacral and interambulacral plates from the sides. 



Fig. 15. The apical disk. 



Fig. 16. The mouth. 



Fig. 17 The vent, with its ossicles. 



Edwaed Foebes. 



October, 1852. 



