Introduction vii 



soon realized that it would serve better to advance the science in which Dean had labored 

 so productively if his materials should be used as the prime basis for a series of original 

 articles by competent authorities to make a Bashford Dean Memorial Volume: Archaic 

 Fishes. The realization of this ambitious project was made possible by continuing co' 

 operation from many sides. First, came the unfailing generosity of Mrs. Bashford Dean 

 and of Dr. Dean's sister, Miss Harriet Martine Dean; secondly, there was the steady sup' 

 port of the Museum, which agreed to publish the memoirs except for the cost of making 

 and printing the lithographed plates; thirdly, came the enthusiastic labors of the editor, 

 Dr. E. W. Gudger, and of his collaborators, especially Dr. Bertram G. Smith, a former 

 student of Dr. Dean at Columbia University. 



The work of preparing the majority of the Articles composing the Memorial fell to 

 the lot of Dr. Smith and Dr. Gudger. Dr. Smith was a professor of anatomy in the New 

 York University College of Medicine, and Dr. Gudger was not only editor of the Dean 

 Volume, but also bibliographer and associate curator of fishes in the American Museum. 

 Hence, since each man had heavy work of his own, the preparation of papers for the Dean 

 Volume necessarily went forward slowly. This will make clear why twelve years 

 elapsed between the publication of Articles I and VIII. However, the results of the 

 labors of all the collaborators speak for themselves. 



In the making of the Bashford Dean Memorial Volume, the technical knowledge and 

 skill of many persons has been utilized. And it is our pleasure to make grateful acknowl' 

 edgment of their devoted services. 



The illustrations in the Volume came from many and various sources. The hundreds 

 of text-figures were made from Dr. Dean's photographs and drawings, and from figures in 

 scores of books and journals wherever they could be found to illustrate our authors' texts. 

 The illustrations from these latter sources were copied in our photographic studio, mainly 

 by Charles H. Coles and Thane Bierwert. Then they were turned over to W. H. South' 

 wick, who, at the very beginning of the work on Article I was chosen as artist of the 

 Dean Memorial Volume. Working with the editor, he prepared all the figures for re- 

 production. His judgment and skill are reflected in the high quality of the illustrations 

 as reproduced herein. 



All half-tone cuts and plates were made by the Sterling Engraving Company of 

 New York City, whose representative, Mr. Harry Duysters, freely gave the editor the 

 benefit of his experience and judgment. 



Certain woodcuts used in the text are of historical interest. The first investigator 

 to study the Japanese frilled shark was Samuel Garman of the Museum of Comparative 

 Zoology, Cambridge, Massachusetts. The illustrations for his researches on the anatomy 

 (1885), antedating the day of line-cuts and half-tones, were made from woodcuts. When 

 Dr. Thomas Barbour, Director of the Cambridge Museum, learned of our work here, with 

 great courtesy he had all these woodcuts collected and sent to us. Even after fifty years 

 a number of these blocks were in such good shape that they were used in illustrating 

 Articles VI and VII of this Volume. 



