MEMOTRS 
OF THE 
CARNEGIE MUSEUM. 
VOL. IV. re NO. 3. 
A REVISION OF THE ENTELODONTIDA. 
: By O. A. PETERSON. 
Inrropucrory REMARKS. 
Since A. Aymard (1, pp. 227-242)? and 8. A. Pomel (73, p. 307; 74, p. 1083) 
described the genus HMntelodon from the Tertiary deposits of France, much material 
has been found, which represents this unique family of mammals, especially in the 
Oligoceneand Miocene formations of the North American Tertiary. The object of the 
present Memoir is first to give a systematic review of the known genera and species 
of this family ; and secondly to describe and illustrate in detail the type specimen 
of Dinohyus hollandi, which was discovered in the Agate Spring Fossil Quarries, 
Sioux County, Nebraska, by the Carnegie Museum Expedition of 1905, and briefly 
described in Science (78, pp. 211-212) and the Annals of the Carnegie Museum 
(81, pp. 49-51). 
At the very outset of his work the writer became fully aware of the fact that 
generic and. specific determinations in this family have sometimes been based on 
rather inadequate types, which present few and unsatisfactory characters. Frag- 
'Pomel’s description (73, 74) of Elotheriwm did probably appear before that of Aymard on Entelodon, but, inas- 
much as the type of the former was rather inadequate, no illustrations were published, and the type has been since lost 
(see page 43), the present writer is of the opinion that the latter name should be used, as both text and figures are 
clear, 
* For the references in parentheses, see the Bibliography appended. : (Published May, 1909.) 
41 
