viii Preface 



my indebtedness to the many gentlemen who, often at much incon- 

 venience to themselves, collected and forwarded these specimens, and 

 especially my appreciation of the scientific spirit which led them to 

 give, wherever possible, the accurate nomenclature of the species, 

 without which the value of the work would have been considerably 

 impaired. 



The publication of these researches has been rendered possible 

 through a grant made for the purpose by the Royal Society, and the 

 generous interest of the Syndics of the University Press, Cambridge, 

 to whom I am greatly indebted. 



G. H. F. N. 



Pathological Laboratory, Cambridge. 

 January, 1904. 



ERRATA. 



Beginning page 298 (Tables) the following names of animals should be corrected 

 the numbers referring to those printed in black letters on the left-hand margin : 



797 read Euplocamus 846 read Bitts 



827 „ Python sebae 857 „ Xenopus laevis 



836 „ Zamenis ravergieri 860 „ Megalobatrachus. 



844 „ Naja Aaje 

 p. 260, top of first column, delete "3. Suborder Hyracoidea, Fam. Hyracidae" 

 and substitute 



1. Suborder 

 MYSTACOCETI. 



2. Suborder 

 ODOXTOCETI. 



