108 FOSSILS FROM THE UPPER GREENSAND. 



has expressed the opinion that they belong to the Hydrozoa and 

 are allied to the spherical Porosphcera of the chalk. 



Those occurring in the Dorset phosphate bed are phosphatic, but 

 are not rolled, being well preserved and evidently belonging to the 

 contemporaneous fauna of the rock. They vary in size from a 

 diameter of '6 to 1-5 of an inch, and they have a peculiar rough 

 surface covered with small tubercular elevations. 



The Parkerise are rare fossils ; besides those at Cambridge a few 

 specimens have been found in the Gault of Folkestone, and there is 

 one in the Jermyn Street Museum from the Greensand of the 

 Haldon Hills, Devon. 



