110 ROYAL SOCIETY OF CANADA 
C— From the Cretaceous rocks of the disturbed region of the Foot-Hills 
and eastern flanks of the Rocky Mountains. 
OSTREA. 
Six specimens of the “ Ostrea shales” from Bighorn Creek, on the 
North Saskatchewan, between the Foot-Hills and the Rocky Mountains, 
collected by Sir James Hector in September, 1858, have their surfaces 
sparingly strewn with valves of a small Ostrea, but only one of these 
valves is sufficiently perfect and well preserved to show its characters at 
all clearly. It is a lower valve, a little more than half an inch in its 
maximum diameter, with only. the inner surface exposed, the exterior of 
its test being completely buried in the matrix, This valve is similar in 
size and outline to some of the specimens of O. congesta (Conrad) figured 
by Meek on plate 9 of the ninth volume of Reports of the United States 
Geological Survey of the Territories, but it shows no trace of attachment 
on its under surface. These pieces of Ostrea shale are evidently those 
referred to on page 243 of Capt. Palliser’s report, in the first entry under 
the heading ‘ Incertæ sedis.” 
CARDIUM. 
Six specimens in the collection, labelled “ Cardium shales, Old Bow 
Fort,” contain numerous imperfect casts of the interior and moulds of the 
exterior of the shell of a small species of Cardium, whose specific rela- 
tions are uncertain. All that these casts or moulds show is that the shell 
is rather strongly convex, obliquely subovate in outline, and that its 
whole surface is marked with somewhat coarse radiating ribs. None are 
sufficiently perfect to admit of a satisfactory comparison between them 
and such forms as the Cardium (Criocardium) speciosum of Meek and 
Hayden, from the Fox Hills group of Montana and Colorado, and the 
Cardium Kansaense of Meek, from the Dakota group of Kansas. 
Old Bow Fort is on the Bow River, in the Foot-hills of Alberta, and 
the six specimens now under consideration were collected in 1858, and 
correspond to the first entry in the list of specimens on page 244 of Capt. 
Palliser’s report. They are also the specimens referred to on page 242 
of that report as “nodules of ironstone from septaria clays occurring on 
Bow River, ten miles below the Old Fort.” They contain obscure Cre- 
taceous fossils. 
D.—From the Nanaimo group of Vancouver Island. 
OsTREA OR SPONDYLUS. (Species undeterminable.) 
Ostrea bella, Etheridge. 1863. No. 44 of the list of specimens on p. 242 of Capt. 
Palliser’s Rep., but probably not O. bella, Conrad, 1857. 
A small piece of glauconitic rock labelled “ No. 48 (below the Lignite), 
Departure Bay, Nanaimo; Ostrea bella, Conrad; Dr. Hector, 1860 ; 
