No. 5.J DAWSON — EOZOON CANADENSE. 283 



me to delineate, in a recent paper, the inverted conical form of a 

 perfect small specimen of Eozoon. and also to show that the 

 acervuline chambers on its upper surface are precisely similar to 

 those small aggregations of spherical chambers resembling Glo- 

 bigerince, and to which I have given the name ArchceospJberince ; 

 so that these may not improbably be loose chambers or germs of 

 Eozoon. 



(3.) Mr. W. J. Morris of Perth, Ontario, has in the past 

 summer found abundant specimens in situ of Eozoon mineralized 

 with Loganite, in the original locality at Burgess. These speci- 

 mens show that the Burgess variety is on the whole thicker and 

 more continuous in its sarcode chambers, and less developed as 

 to the separating walls than the Grenville and Petite Nation 

 specimens. These new specimens from Burgess have also enabled 

 me for the first time to detect in their dolomitised walls traces of 

 the canal system, into which, however, the Loganite does not 

 penetrate. In some in which the dolomite is mixed with calcite, 

 there is also an extremely minute granular structure, which I 

 believe to indicate an originally porous character of the cell-wall,, 

 of which only obscure indications exist in other specimens. 



(4.) Mr. G. F. Matthew has sent to me from the Laurentian 

 of Lily Lake, near St. John, New Brunswick, specimens of a 

 dolomitic limestone containing fragments of the skeleton of Eo>- 

 zoon, shorting the canal system. This is the first recognition of 

 this fossil in the Laurentian of New Brunswick. A notice of the 

 fact has appeared or will shortly appear in " Silliman's Journal." 



(5.) Recent explorations by Mr. Vennor of the Gelogical Sur- 

 vey have thrown further light on the precise geological horizon 

 of Eozoon in the great Laurentian system. In Sir William 

 Logan's original sections on the East side of the Ottawa, the 

 lowest rock represented is a great thickness of orthoclase gneiss, 

 corresponding probably to the fundamental or Bogian gneiss of 

 the Scandinavian and Bavarian geologists. Above this is a very 

 thick limestone, that of Trembling Lake, which has afforded no- 

 fossils. Next is another vast thickness of gneissic beds. Then 

 comes a second limestone, also non-fossiliferous as yet, that of 

 Green Lake. Then another gneissic series and a third limestone^ 

 that of Grenville, which is the special resting place of Eozoon, 

 and is also associated with beds rich in graphite and in calcic 

 phosphate. Still higher ^s a fourth limestone, and then the 

 Vol. VIII. s No 5 



