xii PREFACE 



Regarding acknowledgments:— The early history of the present 

 undertaking has already been recorded (Vol. I, viii-ix). In 1917 the 

 United States entered the war. In this year, fortunately, Volume II was 

 published before the editors were able to find their way into the service 

 of the Government. Dr. C. R. Eastman was presently ordered to 

 Washington and elsewhere, Mr. Arthur Henn enUsted for France and 

 the writer "joined up" with the ordnance department. Then in 

 September, 1918, occurred the lamentable death of Dr. Eastman 

 (c/. Science, Feb. 7, 1919, pp. 139-141), which the writer believes was 

 a direct result of his activities in the war. It was upon him, as we have 

 noted, that the responsibility of editorship had fallen in earlier years 

 (from 1914 to 1917), and it was under his care that Volumes I and II 

 were published. 



In 1919, Dr. Eugene WiUis Gudger, long time Professor of Biol- 

 ogy in the North Carolina College for Women, and our constant 

 correspondent and adviser, consented to become the editor of the 

 Bibliography, much to the satisfaction of his friends in the American 

 Museum. His contributions to the Bibliography include the exten- 

 sive Addenda; expanding and completing the Pre-Linnsean literature ; 

 adding the smaller sections of Bibliographies, Voyages and Travels, 

 Fisheries Journals, and Errata and Corrigenda; certain parts of 

 Morphological Section, and most of the groups in the Systematic 

 Section. And it was by a second stroke of good fortune that we were 

 able again to enlist the help of Mr. Arthur W. Henn on his return from 

 active service: such an arrangement could not have been made 

 without the generous cooperation of Director Holland of the Carnegie 

 Museum of Pittsburgh, in whose faculty Mr. Henn had become curator 

 of fishes. Mr. Henn, we should note, prepared the reference cards 

 and developed the Subject Index; he also is responsible for most of 

 the subjects given in the' Morphological Section, and especially for 

 all the encylopedic articles ; and for the most complicated groups of 

 the Systematic Section, i. e., Anguilla, Pleuronectidse, and Sal- 

 monidse. In addition, the staff of the Bibliography included Miss 

 Francesca La Monte, who stuck to her task with the greatest de- 

 votion and who prepared the Finding Index. 



We should note also that helpful comments were received from a 

 number of our ichthyological friends who were so kind as to read 

 sections of page-proof, notably Professor E. S. Goodrich of Oxford, 

 whose conmients on dermal skeleton, fins and integument are below 

 included; also Professor J. Graham Kerr of Glasgow, whose advice was 

 sought in the technicaha of dentition, growth and age, urinogehital 

 system, and vertebral column. 



