C0NTEMP0EAEIE3 AND SUCCESSORS OP EOZOON. 167 



In European specimens of limestones of Laurentian age, 

 from Tunaberg and Falilun in Sweden, and from the Western 

 Islands of Scotland, I have hitherto failed to recognise the 

 characteristic structure of the fossil. Connemara specimens 

 have also failed to afford me any satisfactory results, and 

 specimens of a serpentine limestone from the Alps, collected 

 by M. Favre, and communicated to me by Dr. Hunt, though in 

 general texture they much resemble acervuline Eozoon, do not 

 show its minute structures. 



