PREFACE 



The vast literature of the Nematoda is extremely scattered 

 and is contained in periodicals dealing with very varied 

 subjects. Ouing to the economic importance of the group 

 there are many students of it ; these must have felt the need 

 of a comprehensive work on the Nematoda, and the present 

 volume is the result of an attempt by Dr. Baylis and Captain 

 Daubney to remedy this deficiency. The Synopsis is not 

 merely a compilation, for the authors have made some im- 

 portant proposals in regard to classification, and have them- 

 selves examined material representing a large proportion of 

 the parasitic genera. 



The authors wish to thank Mr. B. P. Uvarov, whose kind 

 assistance has enabled them to give diagnoses of a number of 

 genera described in the Russian language. The authors also 

 wish to thank those helminthologists who have sent separate 

 copies of their papers ; these have greatly facilitated the 

 preparation of this volume. 



C. Tate Regan, 



Keeper of Zoology. 

 British Museum (Natural History), 

 March, 1926. 



