WHITEAVE9.] CRETACEOUS FOSSILS, NORTH WEST TERRITORY. 163 



As no portion of the thin test is preserved on any of these specimens, 

 it is of course by no means certain that they are really the valves of 

 phyllopod crustaceans. Still, in spite of the circumstance that the 

 other organisms with which they are associated seem to indicate purely 

 marine rather than fresh water or brackish conditions, these little 

 fossils appear to the writer to bear a much closer resemblance to some 

 of the species described and figured by Professor T. Eupert Jones in 

 his " Monograph on the Fossil Bstheriffi," published by the Pateon to- 

 graphical Society, than they do to any lamellibranchiate bivalve. 



The few fossils collected by Dr. Dawson at this particular locality 

 on the Lewes Eiver are, perhaps, not altogether sufficient to indicate 

 the exact position which the rocks from which they were collected 

 occupy in the Cretaceous System. The genera Discina and Estheria 

 have such an extensive range in time that they afford no definite infor- 

 mation on this point. The most characteristic fossil, aj^parently, which 

 has yet been found in these rocks, is the Schloenbachia which has just 

 been described under the name S. borealis. This species appears to be 

 very nearly related to the S. propinqua of the lowest division yet 

 recognized of the Cretaceous rocks in the Queen Charlotte Islands. As 

 will be seen farther on, it occurs also in the Eocky Mountains near 

 Devil's Lake, in deposits which hold several other species of fossils 

 which were first described from specimens collected in the Lower 

 Shales and Sandstones, or Subdivision C of the Queen Charlotte Island 

 Cretaceous. So far as it goes, therefore, the palteontological evidence 

 would seem to show that these rocks on the Lewes Eiver represent as 

 low a horizon in the Cretaceous system as has yet been definitely recog- 

 nized in Canada. 



(2.) From the Eocky Mountains three miles north op the east 

 END OP Devil's Lake; collected by E. G. McConnell in 1887. 



Probably from the same geological horizon as the Lower Shales 

 and Sandstones of the Queen Charlotte Island Cretaceous. 



BEACHIOPODA. 



Terebratula robusta. (N. Sp.) 



Plate 22, figs. 1, 1 a, 1 b and 2. 



Shell large, rather strongly convex, the maximum thickness through 

 the closed valves being very little less than their greatest breadth 

 marginal outline ovately subelliptical, the length being nearly one 

 third greater than the breadth, and the greatest breadth a little in 



