1892.] Geology and Paleontology. 765 
The conclusions here arrived at are: First, that the Egerkingen 
fauna, which Prof. Riitimeyer has already shown to contain a surprising 
number of New World forms, embraces also the true Hyrachyus and 
Isectolophus types, also a form ancestral to the Rhinocerotide. Second 
that the character of the external cusps and the point of union of the 
transverse crests with them are so diverse that some of the different 
species referred to Lophiodon probably belong to distinct genera. I find 
that the forms and relations of these cusps and crests are absolutely con- 
stant and distinctive in the families of American lophodonts and it is 
highly improbable that the single genus Lophiodon should embrace 
specific molar types as different from each other as the family molar 
types are in the American Eocone. 
The question, what is Lophiodon? is yet to be answered. Where 
does it stand with reference to the tapirs, rhinoceroses, hyracodonts ?— 
Henry F. Ossorn, American Museum of Natural History, New 
York, July 12th, 1892. 
