702 EEPORT — 1887. 



but certain tubular fossils found by one of us in tbe crags, and wbicb have been 

 regarded as T. Norvegica, have the opacity characteristic of Aragonite ; and upon 

 this circumstance and peculiarities in its mode of occurrence the opinion was based 

 that the reference of the form to Teredo had been erroneous. In this view the 

 late Dr. Gwyn Jeffreys concurred. The fossil has a sp. gr. of 2'9, and is therefore 

 composed of Aragonite. We offer no suggestion as to its affinities. 



MONDAY, SEPTEMBER 5. 



The following Papers and Reports were read : — 



1. Oil new Fads relafinri to Eozoon Canadense. 

 By Sir J. William Dawson, LL.D., F.B.S. 



For several years no new facts respecting the Canadian Eozoon have been pub- 

 lished, though there has been some discussion on the subject abroad. In so far as 

 the author is concerned, this has arisen from the circumstance that the late 

 Dr. Carpenter had in preparation an exhaustive memoir, for which Canadian 

 material was being supplied, but wliich was unfortunately left unlinished at his 

 death. The material collected for this has now been placed at the disposal of Prof. 

 T. Rupert Jones, F.R.S., and in tlie meantime the present note is intended merely 

 to direct attention to some new facts recently obtained. These are stated under 

 the following heads: — 



1. Form of Edzoon. — -This has been definitely ascertained to be normally inverted 

 conical or broadly turbinate, except where several specimens have become confluent, 

 or where rounded masses have been based on some foreign body. 



2. Pores or Ogciih. — The larger s'iccimens are traversed by cylindrical or long 

 conical vertical openings, around wliich the laminse, becoming confluent, foi"m an 

 imperfect wall. 



3. JBerls of Fragmental Eozoon. — A large series of facts has been obtained to 

 show that considerable beds of Laurentian limestone are composed of fragments of 

 this kind. 



4. Vems of Chi-ysotile. — It is shown that these are true aqueous veins of 

 late origin crossing tlie beds, and the specimens of Eozoon as well. The true 

 nature of the so-called proper wall is defined as distinct from these veins. 



5. Nodular Serpentine. — Nodules and grains of serpentine abound in the 

 Laurentian limestones of the Grenville band. Instances are referred to where these 

 nodules surround, or are attached to, specimens of Eozoon. 



6. State of rreservafion. — The importance of dolomite in reference to this is 

 noticed, also the ditl'erent varieties of contemporaneous aqueous serpentine and the 

 agency of white pyroxene. 



7. Other Laurentian Or(janisms. — Cylindrical or conical bodies resembling 

 stems of plants, with obscure radiating structure, have recently been found asso- 

 ciated with the Laurentian apatite. They may possibly have been organisms allied 

 to Archceocyathus. 



8. Cri/ptozoum. — Certain relations of this new Cambrian fossil to Eozoon are 

 pointed out, and the occurrence of Laurentian specimens hitherto referred to Eozoon 

 but which resemble Cryptozoum. 



9. Laurentian Stratigraphy. — Facts are referred to indicating- the continuity 

 and definitely stratified character of the beds in the Middle and Upper Laurentian 

 of Canada. 



10. Imitative Forms. — A variety of laminated rocks and minerals which had 

 been mistaken for Eozoon were referred to. Their description in more detail will be 

 found in forthcoming memoirs of the Peter Redpath Museum. 



Photographs illustrating some of the more important structures referred to 

 accompany the paper. 



