290 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
from these sections under the direction of Dr. Henry Munthe of the 
Swedish Geological Survey. Nearly all of southern Gotland and 
parts of northern Gotland were examined, much of the study being- 
under the guidance of Dr. Munthe. About ten days were spent in 
Dalarne studying the Leptaena kalk, while Professor Raymond made 
collections from the Brachiopod shales and Silurian horizons of 
southern Sweden. 
In the Kristiana region of Norway, the Malmo and Ringerike 
Silurian sections were studied, the latter under the guidance of Drs. 
Johan Kiaer and Olaf Holtedahl of the University of Kristiana, and, 
as the facies of the latter section is quite similar to that of the Silurian 
of eastern America, while the other Norwegian Silurian sections are 
of a quite different lithology, the failure to see the latter is not of 
great importance, especially since they have been exhaustively studied 
by Professor Kiaer. 
The Russian Silurian and higher Ordovician were carefully exam- 
ined, each of the type-sections of Schmidt being studied, in addition 
to many other outcrops. 
It was also desired to see some of the English sections; but this * 
proved to be impossible. This misfortune was largely made good, 
however, through the courtesy of Dr. Audrey Strahan, Director of 
the Geological Survey of England and Wales, and different members 
of his staff, particularly Mr. John Pringle, who placed, at my dis- 
posal for study, complete detailed collections from Silurian and high 
Ordovician strata, together with the general collections of the Museum 
of Practical Geology. The kindness of Dr. F. Cowper Reed of 
Cambridge University gave the opportunity to examine such collec- 
tions at the Sedgwick Museum of Cambridge as had been made from 
the Keisley and Chair of Kildare limestones, while Dr. F. A. Bather 
of the British Museum very courteously permitted an examination 
of desired parts of that Museum’s magnificent collections. 
In this paper merely a preliminary discussion of the Russian sec- 
tions is given, as the fossils have not yet been studied. 
The opportunity is taken at this time to acknowledge the many 
courtesies and the unselfish kindness received from all from whom 
assistance was desired. Thanks are particularly due to Baron Frey- 
tag-Loringhoven of the island of Oesel, Baron Toll of Kuckers, Baron 
Maidel of Eichenheim, Baron Rosen of Lyckholm, Herr E. von Wahl 
of Addifer, the Directors of the cement plants at Port Kunda and 
Asserien, Dr. 1. P. Tolmacev of the Imperial Academy of Petrograd, 
Drs. Henry Munthe, Johan Kiaer, Olaf Holtedahl, Audrey Strahan, 
