TABLE OF CONTENTS. 



Page. 



Summary 7 



Part I. Principles involved in designating the types of genera of parasites 10-80 



Introduction 10 



Genera other than nematodes included in this paper 11 



Types designated or not designated 11 



Division of work 12 



Homonyms 12 



Historical review of type designation 12 



The principle of generic types foreshadowed by Linnaeus, 1751 12 



The British Association (Stricklandian) Code 13 



The Call Code, 1 877 15 



The American Ornithologists' Union Code, 1886, 1892 17 



The Code of the German Zoological Society, 1 894 18 



The Merton Rules, 1896 18 



Gill, 1896 20 



Durrant, 1898 21 



Code of Botanical Nomenclature, A. A. A. S., 1904 22 



The International Code of Zoological Nomenclature, 1904 23 



Axioms relative to type species 24 



Rules and recommendations concerning types 24 



A. Genera for which types are designated or implied in the original 



publication 25 



1. Genera originally published with only one species. "Mono- 



typical genera" 25 



List of genera (chiefly nematodes) originally published 



with a single species 25 



2. Genera originally published with only one valid species, but 



also with one or more species inquirendte 29 



Nematode genera of this class 29 



3. Genera originally published with a species definitely desig- 



nated as type ( type by original designation ) 30 



Round worm genera with types by original designation 31 



4. Type by original implication through use of the specific name 



typicus or typu* 31 



Nematode genera with type determined by use of specific 



name typicus 32 



5. Type by absolute tautonymy 32 



Cases of type by absolute tautonymy 34 



Case of AngioKtorna Dujardin, 1845 34 



Case of Anguillula Mueller, 1786 34 



Case of Capmlaria Zeder, 1800 37 



Case of Chaos Linmeus, 1767 38 



6. Type by virtual tautonymy 39 



7. Types of rename! genera .*. 40 



8. Type by inclusion . 42 



9. Genera containing types of several earlier genera 47 



Case of Acuaria, Spiroptera, Anthuris, and Dispharagux . . 48 



5 



