278 



DOUGLASS — FOSSIL MAMMALIA 



M 



Lengl li of navicular 021 



Width of navicular 022 



Thickness of navicular, dorso-plantar o:i27 



Length of ectocuneiform 012 



Width of ectocuneiform 020 



Thickness of ectocuneiform 014 



Width of a median metapodial just above trochlea 018 



Thickness of same 015 



Explanation of Plate IX. 



Figs 



. 1- 



Fig. 



1. 



Fig. 



2. 



Fig. 



3. 



Pig. 



4. 



Figs 



. 5 



Fig. 



7. 



Fig. 8. 



Pig. 8a, 



Pig. 9. 



Fig. 9a 



■;?. Arretotherium acridens, gen. et sp. nov. Natural size. From Blacktail Deer creek. 



tipper teeth of right side, Outer view. 



The same, Prom below, In Figs. 1 and 2, premolars 8 and 4 are restored from left side;. The position and 

 arrangement of the antemolars is conjectural, as they were not found in place. 



Left tarsus with distal extremities of tibia and fibula. Navicular restored from right side. 



Agriotha,ru% (?) maximum, sp. nov. Natural size. Molar-premolar series from the right side. From Pipe- 

 stone creek. 



0. Limnenetcs platyceps, gen. et sp. nov. Natural size. From Thompson creek, near Three Forks. 



Bathegenya alpha, gen. et sp. nov. Spec. No. 48. Anterior of left mandibular ramus. Natural size. Pipe 

 stone creek, 



Bathygenyi. Spec. No, (iC. Another individual and perhaps a different species from Pig. 7. The last 



three premolars and the first molar. Natural size. 

 The same, with teeth magnified (our diameters. 



Qylindrodon fontis , gen. et sp. nov. Left mandibular ramus. Natural size. Pipestone creek. 

 Tin; same. Enlarged three diameters. 



For "Literature," etc., see page 279. 



