NEW SPECIES OF MARINE INVERTEBRATE FOSSILS FROM 
THE BEARPAW FORMATION OF SOUTHERN ALBERTA 
By M. Y. Williams, University of British Columbia 
Illustrations 
Plates I and II. Illustrations of fossils 
Page 
68-71 
INTRODUCTION 
In a forthcoming memoir by W. S. Dyer and the writer of this article, 
the general geology of southern Alberta is dealt with; a chapter on strati- 
graphy includes lists of fossils found in the different formations of the 
region. Descriptions of new species of fossils have, however, been left 
for publication in this bulletin. The marine faunas, studied by the author, 
belong to the Pierre sea of Upper Cretaceous age. The marine formations 
represented are, from older to younger, Pakowki shale, Bearpaw shale, 
and a lower, marine shale division of the Fox Hills formation. 
The author wishes to acknowledge his indebtedness to Dr. C. H. 
Crickmay, who made a preliminary study of the ammonites, and called 
attention to the new species herewith described. The ammonites were 
later studied in detail by Louis G. Millward, under the author’s super- 
vision, at the University of British Columbia. 
Of twelve species of pelecypods from the Pakowki shale, thirty-four 
species from the Bearpaw shale, and thirty-one species from the Fox 
Hills formation, as identified by the author, only one new variety was 
discovered. It is described below. 
Of the ammonites, one new species is described, one form is referred 
to a western rather than to an eastern species, and two species are referred 
to different genera from those in which they were originally placed. The 
account of the ammonites is taken, with modifications, from a thesis by 
Millward. 
DESCRIPTIONS 
Class, PELECYPODA 
Order, Teleodesmacea 
Veniella subtrapeziformis (Whiteaves) var. dyeri var. nov. 
Plate II, figures 4-7 
Small, sub-trigonal, gibbous, especially below and backward from the 
umbo, from which a rounded slope emends to the posterior bf»Ral extremity. 
