186 BRITISH TYROGLYPHID^}. 



of organised creatures adopted by the international 

 congress of zoologists held at Paris in August, 1889. 



In the following congress held at Moscow in 1892 

 the question was directly considered, and the Acari are 

 expressly named. The rule is as follows : 



"Art. 16. La loi de prior if e doit prevaloir et, par 



consequent, le nom le plus ancien doit etre conserve . 

 ****** 



" (b) Quand la larve, consider ee par erreur comme un 

 etre adulte, a ete denommee avant la forme parfaite" 



" Exception doit etre faite pour les Gestodes, les 

 Trematodes, les Nematodes, les Acanthocephales, les 

 Acariens, en un mot pour les animaux a metamorphoses 

 et a migrations, dont beaucoup d'especes devraient etre 

 soumises a une revision, d'on resulterait un boulversement 

 profond de la nomenclature." 



In the rules for the scientific nomenclature of animals 

 issued by the German Zoological Society in 1894 the 

 following is found : 



17. " Bei Arten, in deren Generationscyclus verschie- 

 dene For men auftreten, ist als Artbezeichnung nur ein 

 zur Bezeichnung einer entwicJcelten fortpflanzimgsfdhigen 

 Form vorgeschlagener Name zulassig." 



This rule was well translated by Mr. P. L. Sclater 

 for the Zoological Society of London in March, 1896, 

 thus : 



" 17. In the case of species with a cycle of generation 

 of different forms the specific term must be taken from 

 an adult form capable of reproduction." 



At the third International Congress of Zoology held 

 at Ley den in 1895 a Committee was appointed to 

 consider the laws of Zoological nomenclature ; this 

 Committee reported to the fourth Congress held at 

 Cambridge, in 1899, inter alia, thus : 



" 31. The law of priority is valid ; the oldest 

 permissible name is to be retained even 



" (b) If the larva has been named before the adult 

 creature. 



" An exception must be made, at least at present, for 



