Dawson and Carpenter on Eozoon Canadense. 251 
some calcareous Foraminiferal organism which has disappeared, 
Thave already referred to fragments of Hozoon occurring in 
the limestone at Madoc, one of which, found several years ago, 
Idid not then venture to describe as a fossil. It projected 
18 Sliced, it presents interiorly a crystalline dolomite, lim- 
ted and separated from the enclosing rock by a thin wall hay- 
ig @ granular or porous structure, and excavated into rounded 
Meesses in the manner of Hozoon. It lies obliquely to the bed- 
» and evidently represents a hollowed flattened calcareous 
filled by infiltration. The limestone which afforded this 
form Was hear the beds holding the worm-burrows described in 
the Society’s Journal for Nov. 1866, 
_, [A thin section of this body, carefully examined microscop- 
_ iAily, presents numerous and very characteristic examples o 
| be canal-system of Eozoon, exhibiting both the large widely 
late ching systems of canals and the smaller and more penicil- 
tufts (PL III, figs, 4, 5) shown in the most perfect of the 
2 tinous specimens—but with this difference, that the 
_—-Gaals, being filled with a material either identical with or very 
4 Sunilar to that of the substance in which they are excavated, 
Ut $0 transparent as only to be brought into view by careful 
management of the light.—w. B. c ] 
IV. OBJECTIONS TO THE ORGANIC NATURE OF EOZOON. 
Pont ato that it may serve a useful purpose shortly to 
24 ae vegard to the Canadian specimens—with the view of 
ee the discussion from matters irrelevant to it, and of 
ip. igs eedings of Royal Academy of Munich, 1866; Q.J.G.S., vol. xxii, pt. 
: ian. 7. also Can. Naturalist, vol. iii, p. 81. : 
*wourn. Geo -y Vol. xxii, pt. ii, p. 23. ; 
