46 



INSECTIVORA 



The principal bones of the skeleton are known in Tillotherium, but it is only 

 partially known in Esthonyx. Only in the Eocene of North America and England. 



Subfamily 1. 

 2.1.3.3. 



ESTHONYCHINAE. 



I entirely covered 

 o. 1 , o. o. 



with enamel, tvith roots. C rather 



large. 



Esthonyx Cope (Fig. 72). 

 Fig 72. In Lower Eocene Wasatch beds 



Esthonyx burmeisteri Cope. Lower Eocene; Wasatch beds of of Wyoming and New MexicO. 

 Big Horn, Wyoming. ^, Upper dentition. £, Lower dentition PJnfiirhnfirniic HViflrlpsworfh 



showing chewing surface. 2/3 (after Cope). riaiycnoei OPb UnarieSWOl tn 



Flesiesthonyx Lemoine. 



PlatychoerofS 

 in London Clay of England. 

 Lower Eocene of Rheims. Position doubtful. 



2.L3.3. 



Subfamily 2. Tillotheriinae. 

 Upper and lower 1^ well developed, enamelled 



only 



the 



2.L2.3. 



anterior face and with persistent pulp. Small diastemata between I, small C 

 and the most anterior P. 



Fig. 73. 

 TUlotheriwm fodiens "yiaxsh. Bridger beds of Eocene ; Wyoming. Skull and mandible. 1/4. (After Marsh.) 



Tillotherium Marsh (Fig. 73). Skull the same size as that of bear with 

 small cranial cavity and slender snout. The orbits are not separated 

 posteriorly from the temporal fossa. Frontal large, with air cells. The 

 vertebrae are like those of the predaceous animals. Humerus with ente- 

 picondylar foramen. Femur with thii'd trochanter. Fibula slender, 

 astragalus low. Middle Eocene. Bridger beds ; Wyoming. 



Trogosus (Anchippodus) Leidy. Same horizon and locality. 



