Fossils of the Calciferous SandrocJc. 



359 



allied to M. multivohis (Billings) which occurs in the Hudson 

 River group at Anticosti ; but in that species the whorls are still 

 more flattened in the upper part. 



Locality and formation. — At St. Ann's, on the Island of 

 Montreal. Lot 12, con. 12 of the Township of Bagot, in the 

 Calciferous sandrock at the Mingan Islands, in the White lime- 

 stone. 



Collectors. — Sir W. E. Lo^an, J. Richardson. 



MURCHISONIA LINEARIS. (N. S.) 



Fig. 8.— g. 



Description. — Very slender; elongated; apical angle about 

 10° ; whorls twenty or more, convex. Length, two inches or 

 more. 



Of this species we have only impressions, but they are sufficient 

 to shew r that it differs widely from any other known in the Lower 

 Silurian rocks of this country. 



Locality and Formation. — Mingan Islands, White limestone. 



Collectors. — Sir W. E. Logan, J. Richardson. 



MURCHISONIA ARENARIA. (N. S.) 



Fig. 9. 



Description. — The cast of the interior of this species is conical; 

 apical angle about 50° ; whorls four or five, ventricose and ob- 

 tusely angulated in the middle, where there is evidence of a 

 spiral band. Above and below the band the body whorl is flat- 

 tened or depressed convex, the upper whorls more evenly convex. 

 Length, apparently, about three inches; width of body w T horl, 

 two inches. 



The cast of this species somewhat resembles that of some of 



