SECTIONAL TRANSACTIONS.—C. 381 
the entire skeleton now puts this stage completely on the map, and will enable 
us to trace in detail the transformation of every part of the skeleton. It 
remains, of course, to be seen whether our Blanco species is in all respects 
intermediate; it may prove to be a little off the direct line. But the genus 
that it represents is certainly the desired intermediate stage between Pliohippus 
and Equus, and may be known as Plesippus, a somewhat syncopated compound 
from mAfows, ‘near,’ ‘mos, ‘horse.’ The species is probably P. simplicidens 
Cope, described as a species of Yquus, referred by Gidley in 1907 to Pliohippus. 
Phohippus proversus Merriam is referred to the genus. 
4, Dean G. F. Kay.—Some Recent Interpretations of Glacial Deposits 
in lowa. 
Iowa has long been recognised as being one of the most important areas of 
the world for the study and interpretation of glacial deposits of Pleistocene age. 
More than twenty years ago McGee, Chamberlin, Calvin, Leverett, and others 
found evidence, within the State, of deposits which were made during five glacial 
and four interglacial epochs. 
In recent years some extensive field investigations have been made of the 
tills, gravels, gumbotils, fossils, and other materials of the glacial deposits. As 
a result of these studies some conclusions have been reached which differ from 
those of previous workers, and some new criteria have been found which it is 
hoped will aid in the interpretation of the complex history of the glacial period. 
Attention is called to the striking similarity in physical characters of the two 
oldest tills, to the origin of Aftonian gravels and their included faunas, and to 
the significance of gumbotil which had been developed on the three oldest tills. 
It will be shown that, on account of the distinctive characters of the gumbotils, 
their mode of origin, distribution, and topographic position, they are among the 
most satisfactory criteria that have yet been found for distinguishing the older 
drifts. Moreover, the gumbotils are discussed as factors in the interpretation 
of the relative durations of interglacial epochs. 
5, Prof. W. A. Parxs.—The Dinosaurs of Alberta. 
The Red Deer valley in Alberta is a deep gorge through Paleocene and Upper 
Cretaceous strata. Where the brackish-water Edmonton and Belly River forma- 
tions are exposed great numbers of skeletons of dinosaurs are revealed, making 
the region one of the most prolific in the world as regards such remains. 
More than twenty-five special expeditions have resulted in the collecting of 
at least 130 major specimens and a wealth of fragmentary material. The Uni- 
versity of Toronto expeditions (1918-1923) have secured twelve to fifteen major 
Specimens. Hight of these, some new to science, are mounted in the gallery of 
the Royal Ontario Museum. 
6. Dr. F. A. Barner, F.R.S.—The Habits of some North American 
Cystids. 
Thai the evolutionary changes in animals are closely related to their habits 
and environment is a view that has of late lost ground in some quarters. It 
may, therefore, be worth while to show how the varied structures of some 
Ordovician cystids can be interpreted in terms of their mode of life. Forms 
familiar to Canadian hearers are chosen as the chief illustrations : Syringocrinus 
(=Dendrocystis), Anomalocystis, Cheirocrinus, Pleurocystis. 
Afternoon Excursion to examine Paleozoic rocks near Toronto. 
Friday, August 8. 
7. Presidential Address by Prof. W. W. Warts, F.R.S., on Geology 
in the Service of Man. (Page 88.) 
8. Prof. E. 8. Moorr.—The Direction of Cleat in Coal. 
