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Laventille Hills. The bulk of the specimen was composed 

 of a calcareous structure which appeared to me to bear a 

 resemblance to the Eozoon of Dawson and Carpenter. 

 There were also fragments of echinoderms and corals. I 

 described the first-mentioned structure under the name of 

 Eozoon caribeum, pointing out some obvious differences 

 between it and E. canadense. I sent specimens to Dr. 

 Carpenter, who however after a slight examination did not 

 pronounce any definite opinion upon them. He says he 

 treated them with acid ; but that operation could scarcely be 

 of much use except where the spaces formerly occupied by 

 the living body were infiltrated with a silicious deposit. In 

 the present case the infiltration as well as the skeleton itself 

 is calcareous. I should not consider it necessary to insist 

 upon the eozoonal theory in reference to this rock, if evi- 

 dence hereafter point to the contrary ; but I think no doubt 

 can rest upon the organic origin of the whole structure ; and 

 I prefer for the present therefore to adhere to the name of 

 Eozoon caribeum, though subsequent researches may render 

 it doubtful whether it is congeneric with E. canadense. 



Besides the fossil which I have regarded as an Eozoon, 

 and of which the greater part of the specimen just described 

 is made up, there are other organisms observable in it. A 

 few small pieces of coral occur. One form I have named 

 Favosites fenestralis, a minute species, which probably has its 

 nearest analogue in F. fibrosa. No pores or tabulae are 

 visible in our fossil, whence its identification with Favosites 

 may appear to be doubtful ; but I am rather disposed to 

 attribute the absence of those structures to metamorphism. 



The remains of echinodermata are distinct enough to 

 allow of our referring them without doubt to that division of 



