THE 
CaN A DIAN WE CORD 
OF SCIENCE. 
VOL. V. APRIL, 1893. NO. 6. 
NoTES ON THE GASTEROPODA OF THE TRENTON 
LIMESTONE OF MANITOBA, WITH A DESCRIPTION 
OF ONE NEW SPECIES.’ 
By J. FE. Wuitnavezs. 
According to the latest researches of the officers of the 
Canadian Geological Survey, the Trenton limestone of Lake 
Winnipeg and the Red River valley in Manitoba consists 
“at the bottom of a mottled buff and grey ‘lolomitic lime- 
stone, found at Big and Swampy Islands, etc., and probably 
also at Hast Selkirk, above which are other horizontal 
evenly bedded limestones and dolomites, amounting in all 
to a few hundred feet and all more or less rich in fossils.””* 
In the present communication the words Trenton limestone 
will be used to designate all those rocks which intervene 
between the white quartzose sandstone which is supposed 
to be the local representative of the St. Peter’s sandstone of 
Wisconsin, etc., and the Hudson River formation, thereby 
including all those rocks in Manitoba which have previously 
been referred to the Galena limestone. 
1 Communicated by permission of the Director of the Geological 
Survey of Canada. 
? Tyrrell, Trans. Roy. Soc., Canada, for 1891, vol. rx, sect. 4, p. 91. 
