PRE-CAM BRIAN LIFE 



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Fig. II. — Trails of Worms of two types {Psammchnites and Pianilites). 



exhibit the rich and varied fauna of Trilobites and 

 other animals described and figured by Matthew in 

 several successive volumes of the " Transactions of 

 the Royal Society of Canada" (Fig. 12). 



Beds in Newfoundland (the Signal Hill and 

 Random Sound series), underlying the Lower 

 Cambrian, have afforded to Murray and Billings 

 some well - characterized worm-castings of spiral 

 form, and a few problematical forms known as 

 Aspidella, which may be Crustaceans or Mollusks 

 allied to the limpets (Fig. 13). 



In a thick series of pre-Cambrian beds in the 



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