4 



BRITISH FOSSILS. 



well apart, except below, where the larger ones are closely packed. Until the spines 

 shall have been discovered I hesitate to give a name to this form, since it so closely 

 agrees with the figure of the Swiss H. crenularis. 



8. Hemicidaris, Sp. Nov.? — A small depressed form, with very large interambulacral 

 tubercles, and the larger tubercles upon the ambulacral areas occupying half their length. 

 It is imperfect, but probably distinct. It was found in the cornbrash in Dorsetshire, and 

 is contained in the Museum of Economic Geology. 



The following I have not seen : — 



9. Hemicidaris stramonium, of Agassiz ; said by Professor M'Coy to be found in the 

 coralline oolite of Calne, Wilts. On the Continent it is known only from the strata above 

 the Kimmeridge. 



Edward Forbes. 



June^ 1850. 



