frequently had to purchase whole volumes on microfilm in 
order to find the description of a single species. I 
naturally found it necessary to have the title page of the 
volume in which an article was published photographed, but 
it has not always been easy to get libraries to do this, or 
to photograph the plates at the end of a volume, particular- 
ly when no plates were indicated in the original reference. 
This difficulty, however, usually appears only with microfilm 
departments which have been recently established. While 
some libraries are not too well equipped for microfilming as 
yet, I wish to particularly express my appreciation to the 
following libraries for the prompt, courteous, exact service 
which they have rendered me over the years I have been 
gathering ostracod literature: the Universities of Illinois, 
California, Michigan, Minnesota, Wisconsin, Pennsylvania, 
Virginia, Washington, Chicago, Notre Dame, Ohio State Uni- 
versity, Iowa State College, Yale, Harvard, Columbia, Cornell, 
the Library of Congress, and the New York State Department | 
of Agriculture Library. 
I am also indebted to the following libraries and 
individuals for the loan of books or articles which were 
microfilmed by Mr. Guidry of the Louisiana State University 
Library for me: Harvard Museum of Comparative Zoology, Boston 
Public Library, Brown University, New York Public Library, 
Mt. Holyoke, Philadelphia Academy of Sciences, Stanford, Rice, 
