Andrews, "On the Evolution of the Proboscidea", "Phil.
"Darwin and Modern Science" by A.C. Seward and Others
This is clearly exemplified in the case of the Proboscidea, and many other examples could be quoted.
"Form and Function" by E. S. (Edward Stuart) Russell
Proboscidea: an ordinal term for the Coccidae.
"Explanation of Terms Used in Entomology" by John. B. Smith
The only "Ungulates" which cannot be fitted in with some reasonable probability is the group of the Proboscidea.
"The Cambridge Natural History, Vol X., Mammalia" by Frank Evers Beddard