SILURIAN COLLECTION—-HONEYMAN. 17 
directed to the Petraia of Arisaig A, and Lochaber. Specimens 
from the latter locality are considered very beautiful. Gastero- 
poda from A Arisaig, were recognized as Cyclonema crebristriata. 
The first of this Gasteropod which Prof. Hall recognized was in 
the Wentworth collection. 
Trilobites of B, were also examined. Calymene senaria, 
Calymene tuberculata, and Phacops. 
I would observe that the Arisaig A and B, are my. own 
discoveries. Dr. Dawson having only brought the series down 
to B’ Clinton, of Hall. Vide Geology of Arisaig, by D. Honey- 
man, Quarterly Journal of Geological Society, 1864. 
I also discovered the Wentworth equivalent of A and B. 
Vide Nova Scotian Geology,—Intercolonial Railway, Trans., 
1873. Subsequently Mr. McOuat, of the Geological Survey 
made collections in this locality. These led to the belief that the 
formation is of B’, or Clinton age. My extensive collection 
made previously led me to consider “ The Wentworth Group,” as 
approximately “ Hudson River, U.S., or Bala of England,” Loe. 
cit., page 354. Sir William Dawson and Dr. Selwyn have: not. 
examined my collections. 
