Sir Wm. Dawson—New Facts as to Eozo6n Canadense. 53 
zoological relations, it is evident that they occur in the Cambrian 
rocks under the same conditions as Eozoon in the Laurentian. I 
find also in the Laurentian limestones certain laminated forms 
usually referred to Eozoon, but which have thin continuous lamine, 
with spongy porous matter intervening, in the manner of Cryptozoum 
or of Loftusia. Whether these are merely Eozoon in a peculiar 
state of preservation or a distinct structure I cannot at present 
determine. 
9. Continuity and Character of containing Deposits. 
At a time when so many extravagant statements are made respect- 
ing the older crystalline rocks, it may be proper to state that all my 
recent investigations of the Middle Laurentian vindicate the results 
of the late Sir William Logan as to the continuity of the great lime- 
stones, their regular interstratification with the gneisses, quartzose 
gneisses, quartzites, and micaceous schists, and their association with 
bedded deposits of magnetite and graphite, and also the regularity 
and distinctly stratified character of all these rocks. Farther, I 
regard the Upper Laurentian, independently of the great masses 
of Labradorite rocks, which may be intrusive, as an important 
aqueous formation, characterised by peculiar rocks, more especially 
the anorthite gneisses. I am also of opinion that the so-called 
crystalline Huronian rocks of the country west of Lake Superior 
are stratigraphically, and to a great extent lithologically, equivalent 
to the Upper Laurentian of St. Jerome and other places in the 
Province of Quebec, differing chiefly in the greater or less abundance 
of intrusive igneous rocks. 
10. Imitative Forms. 
The extraordinary mistakes made by some lithologists in studying 
imperfect examples of Eozoon and rocks supposed to resemble it, 
and which have gained a large amount of currency, have rendered 
necessary the collection and study of a variety of laminated rocks, 
and considerable collections of these have been made for the Peter- 
Redpath Museum. They include banded varieties of dolerite and 
diorite, of gneiss, of apatite and of tourmaline with quartz, laminated 
limestone with serpentine, graphic granites, and a variety of other 
laminated and banded materials, which only require comparison 
with the genuine specimens to show their distinctness, but many of 
which have nevertheless been collected as specimens of Hozoon. I 
do not propose to enter into any detailed description of these here, 
but hope, with the aid of Dr. Harrington, to notice them in forth- 
coming Memoirs of the Peter-Redpath Museum. 
Postscriet.—It has been suggested by Mr. Julien’ and others 
that Hozoénal structure may be due to the alternation of mineral 
layers formed in the passage-beds between concretions and their 
enclosing mass. ‘The objections to this view are : 
1. Laminated passage-rocks and laminated concretionary forms 
1 Proceed. Amer. Assoc. vol, xxxiil. 1884, pp. 415, 416. 
