or WniTE LIMESTONE FROM JAMAICA. 249 



Two other specimens, one from Belmont, St. Elizabeth, and the 

 other from Mile Gully, appear to have originally consisted of cal- 

 careous orfcanic fragments closely packed. The majority of these 

 now appear only as patches of clear crystalline calcite in a matrix 

 in which the calcite is granular. 



One or two can be seen to be echinoid plates or ossicles, but the 

 crystalline condition of the whole mass makes their identification 

 and comparison with the fragments in the Barbados rocks no longer 

 possible. The fifth specimen, from Belmont, St. Elizabeth, is entirely 

 clear crystalline calcite, in which are outlined many foraminifera, 

 the structure of all other constituents of the rock being lost. The 

 predominating form is Orhitolites*. This rock will not compare 

 with any of those from Barbados. 



Another specimen of a white limestone from Hanover county, 

 Jamaica, was kindly sent me by Col. Peilden ; this, however, proved 

 to be an Oceanic deposit, and a slide of a similar rock was sent me 

 at the request of Mr. Jukes-Browne by Messrs. Watson. Col. 

 Feilden was also kind enough to send me some oolitic coral-rock 

 from Nassau, Bermuda. This is a true oolite, and no coral-rock of 

 Barbados that I examined is in the least like it. 



Discussion. 



Kev. Edwin Hill said that a submergence of the Isthmus had often 

 been thought of in connexion with the Glacial question ; he had 

 hitherto understood that evidence was against this. Thus the views 

 of the Authors were extremely interesting. 



Mr. Attwood remarked that his frequent visits to Barbados, 

 Trinidad, and most of the Antilles, combined with an intimate know- 

 ledge of the Venezuelan coast, the Isthmus of Panama, Colon, Costa 

 Eica, Jamaica, and Hayti, had afforded him opportunities of observing 

 the general geological features of the above-mentioned places, and 

 he could confirm the Authors' opinion in regard to a general 

 uprise of land having taken place in recent geological times in the 

 afore-mentioned countries. The evidences for this were, in his 

 opinion, undoubted, but he thought further evidence should be 

 eHcited as to the date of this movement. He preferred to leave the 

 Gulf-stream theory alone until further information had been 

 collected. 



Mr. J. W. Gregoey asked what evidence the Authors adduced of 

 the submergence of the Isthmus of Panama, as none such appeared 

 in the surveys made for the Canal. He suggested that the difference 

 between the faunas on either side showed that any connexion must 

 have been much earlier than these Pleistocene reefs, of which all 

 the species are living. The evidence of the land-fauna of the 

 Windward Isles supported this. 



Mr. W. Hill could say little with regard to the coral-rocks of 

 Barbados, and the general questions arising from the paper. 



* Dr. Hinde kindly identified this. 



