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PREFACE. > 
19. The radical and epacmic forms of the Arietide probably originated in the North- 
eastern Alps, and migrated from thence southerly and westerly into Italy, and also in 
another direction westerly into South Germany and the Cédte-d’Or. In these last two 
faunas new series of acmic forms arose by modification, and these and the paracmic 
forms which seem to have arisen in the same basins flowed back into the Northeastern 
Alps, and thence into Italy, during Bucklandian and later times. They were also dis- 
tributed from these two basins to all others to the north and south of them in Central 
Kurope. The Northeastern Alps and the South German and Céte-d’Or basins constitute 
a Zone of Autochthones for the Arietidwe, and other faunas to the north and south of these 
are what we have called Residual Faunas. 
The materials in the Museum of Comparative Zovdlogy consist of various 
collections made in England by Damon, Marder, and Wright; Boucault’s 
famous collection from the Cote-d’Or, containing several of D’Orbigny’s types, 
and in part named by him, or by direct comparison with his collection; a 
special and very large general collection, especially rich, however, in South 
German species, purchased from Dr. Krantz; a valuable exchange from the 
Museum at Stuttgardt named by Professor Fraas; Professor Bronn’s collection 
labelled by him; a number of valuable species, principally from Belgium, from 
L. de Koninck’s collection; a similar lot presented by Prof. J. Marcou, from 
various localities in Europe; and others not sufficiently important to be men- 
tioned here. 
ALPHEUS HYATEL. 
CampBripGE, April, 1889. 
