12 CAMBRIAN BRACHIOPODA. 



'Mr. J. F. Nery Delgado, of the Geological Survey of Portugal, presented photographs of 

 several of the Lower Cambrian brachiopods described by him from Portugal, also a specimen 

 of the new form Delgadella lusitanica. 



Dr. Charles Barrois, of the University of Lille, France, gave information in relation to the 

 Cambrian faunas of Spain and France. 



Dr. Karl A. GronwaU, of the Geological Survey of Denmark, made a collection of Cambrian 

 fossils for me in Bornholm, among wliich were fine representatives of the brachiopods described 

 by liim in his memoir on the Paradoxides fauna of Bornholm. 



Dr. J. F. Pompeckj, of the University of Hohenlieim, Wurttemberg, Germany, was always 

 ready to give information and assistance. . 



Dr. T. H. Holland, director of the Geological Survey of India, generously loaned for study 

 the collection of brachiopods from the Cambrian formations of the Salt Range, and gave me 

 the opportunity of studying and illustrating Doctor Waagen's types. 



Prof. Walter Howchin, of the University of Adelaide, South Australia, sent for study 

 and illustration all the types of Cambrian fossils described by Messrs. R. Etheridge, jr., and 

 Ralph Tate. 



As a result of the expedition of the Carnegie Institution of Washington to China under 

 the direction of Mr. Bailey Willis, assisted by Mr. Eliot Blackwelder, large collections of fossils 

 were made from many faunal horizons of the Cambrian, and among them the various bracliio- 

 pods described in this volume. 



Dr. W. C. Brogger, of the University of Christiania, Norway, very generously loaned the 

 types described by him in ' 'Die Silurischen Etagen 2 und 3, " also duplicate material of Cam- 

 brian brachiopods wliich he had collected at various localities in Norway. 



Dr. N. Olof Hoist, of the Geological Survey of Sweden, very Idndly took charge of the 

 making of collections of Cambrian fossils for me by Mr. G. Schmalensee, a collector of the 

 Survey, and also permitted the sending of specimens for study and in exchange. 



Dr. Joh. Chr. Moberg, of Lund, Sweden, both loaned and presented material for study. 



Through the courtesy of Dr. Carl Wiman, of Upsala, Sweden, I had the opportunity of 

 studying the Cambrian brachiopods described by him from the North Baltic region. He not 

 only sent me the specimens, but also answered inquiries in relation to certain facts concerning 

 them which did not appear in the text of his report. 



I am greatly indebted to the Geological Survey of Canada for the loan of many of the types 

 in the collections of the Survey museum. Prof. J. F. Wliiteaves and Dr. Henry M. Ami were 

 especially kind in selecting and forwarding the specimens desired. 



Sir Wilham E. Dawson permitted me to look over the collection of the McGill Uni- 

 versity museum, and later Dr. Frank D. Adams sent specimens of the Cambrian brachiopods 

 in the collection. 



For many years before the sale of his collection. Dr. George F. Matthew, of St. John, 

 New Brunswick, frequently loaned me his types and study material, and also when I visited 

 New Brunswick directed me to the most favorable localities for collecting material both in 

 New Brunswick and Cape Breton. Wlien his collections went to the University of Toronto, 

 Prof. W. A. Parks sent to me from them the various types that I needed for study and illus- 

 tration. 



Prof. Alexander Agassiz permitted me to study the collections of Cambrian brachiopods 

 in the Museum of Comparative Zoology, and also to take to Washington and have illustrations 

 made of a number of specimens, especially those from Bohemia. 



Prof. J. M. Clarke, director of the New York State Museum, Albany, N. Y., was most 

 courteous in lending material and giving information relating to it. 



Mr. W. A. Finkelnburg, of Winona, Mnn., sent material from his collection, and also made 

 collections from the "St. Croix sandstone" at several locahties in Minnesota, which enabled 

 me to add very materially to the description of the Cambrian brachiopods of Minnesota. 



Prof. Alpheus Hyatt, of the Boston Museum of Natural History, lent material he collected 

 on the coast of Labrador, and he was always ready to discuss problems connected with the life 

 history and evolution of the Brachiopoda. 



