326 R. S. Lull — Mammals and Homed Dinosaurs. 



MuXTITUBEECULATA 



Ptilodus montanus Douglass 

 " gracilis Gidley 



" serratus? (Marsh) 

 " formosus f '(Marsh) 



Insectivoea 



Pentacodon f sp. 

 Myxodectes? sp. 



Caenivoea 



Creodonta 

 Chriacus sp. 

 Oxyclcenus sp. 

 Tricentesf sp. 

 Deltatherium ? sp. 

 Didymictis sp. nov. 



= Cimolomys~\ 

 ] 



T^ENIODONTA 



Psitlacotherium sp. 



CONDYLAETHEA 



Miocloenus sp. nov. 

 Euprotogonia sp.nov. 



Taligeada 



Ectoconus? sp. nov. 

 Pantolambda sp. 



Matthew (1914, p. 389) adds to this list : 



? Maestjpialia 



? Batodon sp. 

 ? Cimolestes sp. 

 f Peratherium sp. 

 Picrodus silberlingi Douglass 



Insectivoea 



Goriphagus montanus Douglass 

 Megopterna minuta Douglass 



Caenivoea 



Creodonta 

 Protochriacus sp. 



Taligeada 

 Anisonchus sp. 



The two doubtfully determined species of Ptilodus described 

 by Marsh as Gimolomys occur in the Lance of Niobrara 

 County, Wyoming. All the other species in Gidley's list show 

 affinities with tho Torrejon fauna of New Mexico. 



Clamodon ferox (Cope) and Pantolambda cavirictus? Cope 

 were obtained in Fort Union number 3, with an abundant Fort 

 Union flora. Both Clwnodon and Pantolambda are typical 

 Torrejon genera. Comparing the mammals of the upper Fort 

 Union with those of the Torrejon, Matthew says (1914, p. 392) 

 that they appear " to be of the same age, as indicated by the 

 identity of a part of the fauna. But it [Upper Fort Union] 

 apparently represents a somewhat different facies, with certain 

 points of analogy to the Lance." 



The Lance mammals, wherever they are found, generally lie 

 in more or less close association with ceratopsian skulls, and 1 

 have no doubt that such highly specialized members of the 

 dinosaurian phylum represent very limited environmental con- 



