FROM THE INFERIOR OOLITE. 193 



my collection, and the fine series in the Bristol Museum, with one found by Mr. W. H. 

 Baily, are the only specimens I know. 



History. — First figured as Arbacia Forbesii, in my ' Memoir on the Cidaridse of the 

 Oolites/ It was afterwards referred by M. Desor, in his Synopsis, to the genus Magnotia, 

 and appears to form a good type of that new group ; it is the only English example of 

 the genus we at present possess. 



