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. I. P. Tolmacev of the Imperial Academy of Petrograd, 

 Drs. Henry Munthe, Johan Kiaer, Olaf Holtedahl, Audrey Strahan, 



