G. M. DAWSON ON A NEW SERIES OF LOFTUSIA, 69 
5. On a new Spxcrzs of Lorrusra from Bririsa Corvmpra. By 
Grorex M. Dawson, D.S., Assoc.R.S.M., F.G.S., of the Geo- 
logical Survey of Canada. (Read June 5, 1878.) 
[Prats VI.] 
In 1869, Dr. W. B. Carpenter and Mr. H. B. Brady described, in the 
‘Transactions’ of the Royal Society, two remarkable types of gigantic 
arenaceous Foraminifera, under the generic names of Parkeria and 
Loftusia. For the description of the latter form Mr. Brady is more 
particularly responsible, and to the genus then created by him I have 
now to add another species, for which the name of Loftusta colum- 
biana is proposed. 
The original specimens of Loftusia were obtained many years ago 
by Mr. W. K. Loftus in Persia. They were referred to in his paper 
‘on the geology of the Turco-Persian frontier and districts adjoining, 
published in the Quarterly Journal of the Geological Society in 1855, 
but remained undescribed till they came into Mr. Brady’s hands. 
From the geological descriptions by Mr. Loftus, and other forms of 
Foraminifera found in the same stones, Mr. Brady believes the geo- 
logical position of Loftusia persica to be in the oldest Tertiary rocks. 
The specimens now to be described are from the interior of British 
Columbia, and their age is, I believe, Carboniferous. Examples of 
the form were first collected by Mr. J. Richardson, of the Geological 
Survey of Canada, in 1871, and are mentioned in the Report of 
Progress for 1871-72. Abouta year ago, I examined Mr. Richard- 
son’s specimens with some care; but during the past summer, having 
opportunity to visit the locality from which they were procured, the 
occasion was taken to collect a large number of additional specimens, 
representing all varieties of appearance and preservation. Mr. 
Thomas C. Weston has prepared from these and Mr. Richardson’s 
specimens a number of transparent sections, from which the accom- 
panying descriptions and drawings have been made. 
Most of the specimens are from Marble Canon, a remarkable valley 
which runs through from the banks of the Fraser River to the bend 
of Hat Creek, with a direction nearly transverse to that of the main 
features of the country. For a distance over ten miles, the sides of 
the valley are formed almost continuously of mountains of limestone 
or marble. The first impression is that an immense thickness of 
limestone is represented in the exposures; but, aithough the dips are too 
obscure to allow the attitude of the beds to be worked out throughout 
the length of the Cafiion, some small sections show that part at least 
of the beds have been sharply folded and the whole series of folds 
overturned. This being the case, it may be that a comparatively 
thin limestone or series of limestones forming a succession of folds 
superimposed on a broad anticlinal flexure account for the appear- 
ance presented. That the limestones have a very considerable thick- 
