362 Canadian Record of Science. 



faunas existing in Division I., so far as this has been ascer- 

 tained : — 



Eangb of Genera. 



Genera peculiar to Band b 5 



" that pass from b to c 5 — 10 



" peculiar to c 7 



" that pass from c to d 15 — 22 — 32 



Deduct genera common to b, c and d 5 



27 

 Add genera peculiar to d 3 



Total number of genera 30 



Eange of Species. 



Species peculiar to Band b 6 



" that pass from b to c 5 — 11 



" peculiar to c 29 



" that pass to d 6 



" by varieties 7—42—53 



Deduct species common to b, c and d 4 



49 

 Add species peculiar to d 16 



Total number of species 65 



B. — PRELIMINARY NOTES ON THE HIGHER CAMBRIAN FAUNAS 

 OP THE ACADIAN REGION. 



Owing to the prevalence of shallow water conditions in 

 the St. John basin during much of the time in which its 

 deposits were forming, it is not easy to distinguish the 

 upward limit of the formation, or to say how much of 

 Cambrian time is represented in its deposits; it is highly 

 probable, however, that it covers nearly the whole of the 

 Cambrian age, as the Ctenopyge beds, whose place is 

 shown further on, consist of a great mass of fine-grained, 

 dark grey and black, slaty shales, which are undoubtedly 

 deep water deposits. Burrows and trails of sea-worms, and 

 shells of Lingulella, etc., are found in the sandy beds above 

 and below these Ctenopyge shales. By means of the Cte- 

 nopyge beds, and by what is known of the Cambrian fauna 



