400 THE CANADIAN NATURALIST. [Vol. Tiii. 



ON SOME JURASSIC FOSSILS FROM THE COAST 

 RANGE OF BRITISH COLUMBIA. 



By J. F. Whiteaves. 



The fossils which form the subject of the present paper were 

 collected by Mr. G. M. Dawson at three localities in British 

 Columbia during the summer of 1876. By far the greatest 

 number of specimens are from the left bank of the Utasyouco 

 River, four miles above its junction with Salmon or Dean River ; 

 two are from the falls of the Utasyouco, three miles below the 

 last mentioned locality, the rest] are from Sigutlat Lake. The 

 Utasyouco River, it may be mentioned, is a stream about six 

 miles in length, which flows from Sigutlat Lake into the Salmon 

 River, which it joins in Lat. 52° 53' and Long. 126° 15' ap- 

 proximately. The geological structure of the district and the 

 lithological characters of the rocks are described by Mr. Dawson 

 in the Report of Progress of the Geological Survey of Canada 

 for 1876-77, now in course of publication, for which these notes 

 were originally written. The collection consists of twenty-seven 

 species of Mollusca and one of Annelida. With very few ex- 

 ceptions, the fossils are both imperfect and in a poor state of 

 preservation, so that their generic position even is sometimes 

 doubtful. The Ammonites, in particular, are almost all mere 

 fragments. The following is a provisional list of the species, 

 with short descriptions of such as appear to be new, and critical 

 remarks on others. 



1. Terebratula ? — Shell (or rather cast) compressed, 



very gently convex ; outline ovate or obovate ; length greater 

 than the width at all stages of growth ; thickness through the 

 closed valves about equal to one half the width ; no mesial fold 

 or sinus. The shape varies in different individuals ; the maxi- 

 mum width being nearly always in advance of the middle, but 

 one specimen is broadest at a little distance from the hinge line 

 and somewhat pointed in front. Two half grown examples are 

 ovately-orbicular, and not longer than wide, but the rest are 

 much more elongated. Beak of the ventral valve incurved (but 

 scarcely so much so in the cast as to entirely conceal the delti- 



