PLATE XIX. 



FIG. 1. A sketch of the part of the recent pentacrinus described by Mons. Guettard. 



2. The superior part of a pentacrinite, found at Pyrton Passage, Gloucestershire. 



This sketch is copied from the fifty-second volume of the Philosophical Trans- 

 actions. 



3. Part of a funnel-formed alcyonium, filled with, and surrounded by, the green 



sand of Pewsey, in which it was found *. 



* Not having been favoured with this specimen in time, I was unable to notice it in the 

 body of the Work, or introduce it in the earlier Plates: and not having it, therefore, in my 

 power to compare the Pewsey fossils with that represented in the Frontispiece, I was unable 

 to determine whether the information which I had received respecting the locality of the 

 latter fossil was correct or not. Comparison now enables me to state, that the alcyonite in 

 the Frontispiece appears to agree exactly in structure with the Pewsey alcyonites; but that 

 the latter have evidently undergone a much more considerable chemical change than the 

 former. The degree and kind of chemical change which the latter fossil has suffered, 

 seems indeed to authorise its being considered as a French fossil. 



