A LIST OF THE GENERA AND FAMILIES OF MAMMALS. 69 
In the preparation of the manuscript for the press Miss Louise de 
Bonneville has rendered much assistance in checking derivations and 
looking up the application of names. 
Finally, special mention should be made of the careful and pains- 
taking work of Miss Thora Steineger, who under my direction has 
looked up many of the references, indexed most of the families, added 
many names, and typewritten practically the whole list with great 
care. During three trips abroad she verified numerous references in 
the libraries in Bergen, Berlin, London, and Paris, and her visit to the 
library of the Zoological Society of London brought the index to the 
notice of Mr. Waterhouse and eventually resulted in the acquisition 
of his manuscript. 
