Dawson and Carpenter on Eozoon Canadense. 249 
: those found elsewhere, it would appear that the chambers are 
this may have been the same in the present specimen and in 
that originally obtained from the Calumet, while in the speci- 
mens from Grenville a massive and aggregative mode of growth 
seems to have obliterated all distinctness of individual shape. 
Without additional specimens, and in the case of creatures so 
Variable as the Foraminifera, it would be rash to decide 
_ Whether the differences above noticed are of specific value, or 
depend on age, variability, or state of preservation. For this 
sl microscopic structures are nearly the same in kind with 
of specimens figured in former papers, I have not 
3 ment of parts (see Pl. II). 
noe Concluding remarks.—In a letter to Dr. Carpenter, 
ote by him in the ‘ Quarterly Journal of the Geologic 
of es August, 1866, p. 228, I referred to the occurrence 
meng ', . Preserved simply in carbonate of lime. The speci- 
at Which enable me to make that statement were obtained 
ag omega Tudor, this region being one in which the Lau- 
-—Phosed than 4 ery 
: 8 usual, The specimens from Madoc, however, 
ee fragments, imbedded in the limestone, and incapa- 
SEL APR, | 
1 
Aur, Jour, 
