10 



BRITISH FOSSILS. 



M. amhitu ovato-cordato, dorso convexiusculo, postice leviter arcuato, elongato ; ambulacris 

 dorsalibus impressis, assulis arearum ambulacraliitm dorsalium planis, Icevigatis. 



I have seen specimens of this species, which attain a length of 3 inches by 2^ at its 

 broadest part, and a height of 1 inch fg, in the collection of the lamented Mr. Dixon of 

 Worthing, who had it from Sussex ; in Mr. Bowerbank's collection ; and in the Museum 

 of the Geological Society, where there are specimens from Charing, Kent, presented by 

 Mr. W. Harris, and from Herael Hempstead, presented by Mr. H. C. White. 



In Mr. Bowerbank's collection there are specimens, unfortunately not in sufficiently 

 good condition, of a small Micraster, with a very elevated extremity, from the lower 

 chalk of Lyme, which is possibly a distinct species, 



Edward Forbes. 



June, 1850. 



