TABLE OF CONTENTS. 



Introduction 5 



On type specimens in natural history 7 



Classification of type specimens 9 



Primary types, or proterotypes 9, 10 



Holotype 10 



Cotype 11 



Paratype 11 



Lectotype 12 



Chirotype 12 



Supplementary types 9,12 



Plesiotype 12 



Neotype 13 



Heautotype 14 



Typical specimens, or icotypes 9, 14 



Topotype 14 



Metatype 14 



Homceotype 14 



Ideotype 15 



Type drawings 15 



Reproductions of type specimens 15 



Types of genera, or genotypes 16 



Types of organisms in relation to geographic distribution 16 



Marking of type material 17 



Literature on type terms 17 



Catalogue of the type specimens 19 



3 



