242 Dr. Skey on the Geology of Barhadoes. 



Additional Note by Mr. Parkinson, 



The specimens Nos. 1. and 4. illustrate the nature of some fossil 

 corals, showing that the forms in which they at present exist are 

 not those which belonged to the same substances in their original 

 state, and consequently ought not to affect their specific or generic 

 distinctions. 



In some of these specimens only circular or polygonal cavities 

 occur, which possess no internal radiated structure, but have their 

 insides more or less crenulated. Dr. Skey's specimen No. 4, is 

 chiefly composed of empty cylindrical cavities with slightly crenu- 

 lated sides ; but in two of these cavities, near the center of the 

 specimen, erect lamellse are disposed in a stellulax form, evincing 

 that the corresponding lamellae of the other cavities have been 

 removed by accident. 



In other specimens are erect radiating lamellae not surrounded 

 by any parietes. Dr. Skey's specimen No. 1. is also thus composed 

 of lamellcB forming stellular columns, between which no parietes 

 are disposed. But in one .part of this specimen the compleat form 

 of the madrepore appears, two or three of the radiated columns 

 being here surrounded by similar parietes with those which are 

 seen without any columnar portion in specimen No. 4, showing 

 that this was the original form of the madrepore, and proving the 

 identity of the madreporean remains in both Dr. Skey's specimens^ 

 Nos. 1. and 4. 



