264 HENRY b. ward: 



The number of the volume is printed in lower case Roman 

 numerals, and comes first, except that an antecedent Arabic 

 figure may designate the series, if such exist. All other num- 

 bers are Arabic, and the last of these bearing no added desig- 

 nation is the page number. The latter may however be fol- 

 lowed by the number of figures or plates in which case these 

 numbers are always accompanied by a designative abbreviation, 

 jig. or p>l. The number, part, or article, is quoted only when 

 paged separately, unless there was some uncertainty concerning 

 some other part of the reference. Many references are 

 incomplete, because (1) the article was entirely inaccesible, 

 (2) the reprint in my library did not show the precise location 

 of the article, or (3) disagreement between my card catalogue 

 and the printed reference in one of the bibliographical records 

 left uncertain the source of the error, and the paper referred to 

 was not accessible here. 



An example will perhaps make the method of citation 

 clearer : 



xiv, 4, means vol. xiv, page 4. 



xiv, 4, 4, means vol. xiv, part or number 4, page 4. 



4, xiv, 4, 4-42, means series 4, vol. xiv, part 4, page 4-42. 



xxi, 1-3, 17-92. 4 pi. 7 fig., means vol. xxi, part 1 to 3, 

 p. 17 to 92, 4 plates, and 7 text figs. 



It is but fitting that I should acknowledge here my in 

 debtedness to the various sources of information especially the 

 bibliographical records in zoology; to the many individuals only 

 a general acknowledgment of the courtesies can be made, but 

 of my debt to Professor J. E. Reighard of the University of 

 Michigan, who kindly placed his entire card catalog at my 

 service, special mention should be made. 



