66 



The Ottawa Naturalist. 



[July 



formis of Meek and Hayden, from the Jurassic rocks of the Black 

 Hills of Dakota, that was first described in 1858, is evidently a 



typical Cardioceras. 



Three years ago, in June, 1900, Mr. James McEvoy who was 

 then on the staff ot the Geological Survey, discovered a small 

 specimen of an Ammonite, that appears to be a true Cardioceras, 

 from a coarse grit near the top of a ridge running N. 20° E. and 

 situated two miles and a quarter N. 70° E. from Fernie, B.C., 

 about 4,000 feet above the sea level. The specimen is only a 

 natural hollow mould of the exterior of a shell that is imperfect at 

 the aperture and about thirty-two millimetres, or an inch and a 

 quarter, in its maximum diameter. But, this mould is so sharply 

 defined that good white gutta percha impressions of it, or 

 " squeezes " from it, show both the shape and surface markings 

 of the whole of one side of the fossil and of part of the other, 



remarkably well. 



These impressions indicate the immature stage of a species 

 of Cardioceras that seems to be very closely related to the Euro- 

 pean C. cordatum, but that may be provisionally named and de- 

 scribed as follows. 



Cardioceras Canadense, nom. prov. 



Cardioceras Canadense. 

 Fig. I. Side view of a gulta percha impression from the natural 



mould collected by Mr. McEvoy. 

 Fig. la. Peripheral view of the same, slightly restored on one side. 

 Fig. I shghtly enlarged, Fig. i a of the natural size. 



