106 PROCEEDINGS OF THE SCIENTIFIC ASSOCIATION. 
Laventille Hills. The hulk of the specimen was composed 
of a calcareous structure which appeared to me to hear 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 siliceous 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 corals 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 
