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PROCEEDINGS HELMINTHOLOGICAL SOCIETY VOL. 2, NO. 1 



male, and J for young or immature specimens are used throughout the 

 key as a means of saving space; "c? only," for instance, indicates 

 that only the male form is known. The % sign is used to mean per- 

 cent of body length, or, distant from anterior end, measured in percent 

 of body length. 



In general the intention has been to include all synonyms, together 

 with the corresponding accepted generic names. The case of Di- 

 chromadora and Trichromadora, Kreis 1929, is an exception; these 

 designations seemed to cut across the accepted classification in such a 

 way as to make their inclusion impracticable. 



Through the much appreciated courtesy of the United States Bureau 

 of Fisheries, a part of the work on the key had been carried out at its 

 Laboratories at Woods Hole, Mass. Needless to say, the work could not 

 have been completed or completion even attempted by us without the 

 resources and the expert advice of the Division of Nematology, of the 

 Bureau of Plant Industry, U. S. Department of Agriculture, within 

 which the work has been done. Dr. G. Steiner and Dr. J. R. Christie have 

 given never-failing aid. Dr. Maurice Hall and Dr. B. Chitwood of the 

 Division of Zoology have also given generously of their time, their 

 knowledge and their experience. 



MARGARET V. COBB. 



ABBREVIATIONS USED IN KEY 



