160 
Psyche 
[June 
from that of Fabricius, which had previously dominated, 
because of the growing conviction that each haustellate 
order had an independent origin. This and the other trends 
can be best shown in tabular form, which gives the period 
during which each proposed arrangement was employed. 
Bases of Order Groupings 
Thorax Linnaeus 1735-1852 
DeGeer 1752-1789 
Latreille 1806-1868 
Newman 1841 
Mouth Fabricius 1775-1922 
Clairville 1798 
MacLeay 1823-1835 
Kirby and Spence 1823-1864 
Agassiz 1849-1850 
Figuier 
Mayer 1882-1901 
Hertwig 1895-1902 
Thorax and Mouth Cuvier 1805-1889 
Fernald 1921-1923 
Thorax, Metamorphosis and Dominance 
Oken 1821-1858 
Hyatt and Armes 1890-1928 
Metamorphosis and Dominance 
Burmeister 1832-1905 
Claus and Sedgwick 1885-1895 
Balfour 1885-1886 
Davenport 1900 
Martini 1923 
Imms 1925 
Thorax and Metamorphosis de Hoven 1856-1926 
Dana 1864-1928 
Woodworth 1906 
Crampton 1920 
Tillyard 1926 
