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Guppy Rp:prixt 
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Page io6 
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 
Eozoo 71 caribeum, pointing out some obvious differences 
between it and E. canade7ise. 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 formerl}' occupied by 
the living body were infiltrated with a silicious deposit. In 
the present ca.se the infiltration as well as the skeleton itself 
is calcareous. I should not consider it necessarj' to insist 
upon the eo/.oonal 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 
Eozooii caribeiwi, though subsequent researches may render 
it doubtful whether it is congeneric with E. ca7iade7ise. 
Besides the fossil which I have regarded as an Eozoon, 
and of which the greater part of the specimen just de.scribed 
is made up, there are other organisms observable in it. A 
few small pieces of coral occur. One form I have named 
Eavosites fenest7'alis, a minute species, which probably has its 
nearest analogue in E. fibrosa. No pores or tabulae are 
visible in our fossil, whence its identification with Eavosites 
may appear to be doubtful : but I am rather disposed to 
attribute the ab.sence of those structures to metamorphism. 
The remains of echinodermata are distinct enough to 
allow of our referring them without doubt to that division of 
