352 On Eozoin Canadense. 
the Canadian Survey, it would seem that these organisms grew 
in groups, which ultimately coalesced, and formed large masses 
penetrated by deep irregular canals; and that they continued to 
grow at the surface, while the lower parts became dead, and were 
filled up with infiltrated matter or sediment. In short, we have 
to imagine an organism having the habit of growth of Carpen- 
teria, but attaining to an enormous size, and by the aggregation 
of individuals assuming the aspect of a coral reef.” 
‘The complicated systems of tubuli in the the Laurentian fos- 
sil indicate however a more complex structure than that of any 
other fragments, which are probably organic, and which may in- 
dicate the existence of otheranimal remains, Films of carbon- 
m h b 
of —— He further adds, that “although the abundance and 
vide 
have acted in the accumulation of limestone, indicate that it was 
in order to the existence and growth of these large Rhizopods, 
the deposition of the serpentine and pyroxene 12 
remains have been preserved, or both, may have beet 
4 with certain oceanic depths i and that 
