6 TABLE OF CONTENTS. 



PART I. Principles involved in designating the types of genera of parasites Page. 

 Continued. 

 Rules and recommendations concerning types Continued. 



B. Genera for which types have been selected in later publications. . 52 



10. Type by subsequent designation 52 



Roundworm genera with types by later designation 53 



C. Genera for which no type has been definitely selected 55 



11. Collective biological groups requiring no type species 55 



12. Type by elimination 56 



Elimination of species Tnquirendse (see p. 29) 57 



Elimination of doubtfully referred species 57 



Elimination of species selected as types of other genera. . 58 



Restricted and unrestricted elimination 58 



13. Preference to be shown to species not subsequently classified 



in other genera 60 



14. Type by page precedence 62 



15. Sexually mature forms take precedence over larval or imma- 



ture forms 63 



16. Preference to be shown to species examined by author of the 



genus 63 



17. Preference to be shown to species named communis, vulgaris, 



officinalis, or medicinalis 64 



18. The best described, best figured, best known, or most easily 



obtainable species 64 



19. The original generic name to go with the greater number of 



species 65 



20. Special points to be considered in connection with genera of 



parasitic groups 65 



21. Remaining genera mentioned in this paper 66 



Correlated nomenclatural questions 67 



22. Synonymy by original publication 68 



23. Rule of homonyms 69 



Roundworm generic names which are absolutely preoccu- 

 pied , ." 70 



Roundworm generic names which absolutely preoccupy 



other names 71 



24. Phononyms 72 



25. Doubtful homonyms 73 



26. Emendation of names 76 



27. Nomenclatural status of misprints 78 



28. Origin of the Law of Priority 78 



29. Rudolphi's Rules of Nomenclature 78 



30. Polynomial authors between 1758 and 1819 80 



Part II. List of generic names, chiefly nematodes, with their original and type 



species 81-150 



Addenda 150 



