THE SMALL ENTELODONTS OF THE WHITE RIVER 



OLIGOCENE. 



Investigation aided by a grant from the Marsh Fund of the National 

 Academy of Sciences. 



By WILLIAM J. SINCLAIR. 



(Read April 22, 1922.) 



Contributors to the literature on the entelodonts or so-called 

 " giant pigs " are in agreement in regarding the small animal with 

 closely crowded lower premolars (p^ excepted) from the Titano- 

 therium beds of the Cypress Hills, Saskatchewan, generally known 

 as Archcrothenum coarctatum Cope, not only as quite distinct specifi- 

 cally, but also as more primitive than the other American forms, Mr. 

 Troxell in his recent paper even referring it to the European genus 

 Entelodon} 



The Princeton Expedition of 1921 was so fortunate as to secure 

 from the Oreodon beds the skull and lower jaws of a small entelodont 

 with unspaced lower premolars (the first excepted) and reduced m^, 

 and a search through our own collections and those of the American 

 Museum of Natural History, kindly placed at my disposal by Pro- 

 fessor Osborn and Dr. Matthew, has brought to light additional mate- 

 rial which makes it desirable to view the situation somewhat differ- 

 ently from that indicated above. 



The recently acquired Princeton specimen (No. 12624, Figs, i A, 

 2, ^ B, 4 A) was found by Mr. H. R. Wanless, to whom we are 

 indebted for the discovery of so many fine entelodont skulls during 

 the last two summers, and is from clays intercalated in the lower zone 

 of rusty nodules in the Lower Oreodon beds at Culbertson's^ locality 

 on Bear Creek (Princeton collecting locality 1016E2A) about four 



1 E. D. Cope, " Contributions to Canadian Paleontology," Vol. III., pp. 

 20-21, PI. XIV., Figs. 3, 2a, 1891. O. A. Peterson, Memoirs Carnegie Museum, 

 Vol. IV., No. 3, pp. 55-56, Fig. II, 1909. E. L. Troxell, American Journal 

 of Science, Vol. L., p. 249, 1920. 



2 See T. A. Culbertson's diary under date of May 14, 1850, in Fifth An- 

 nual Rept. Smithsonian Inst, p. 93. 



