22 



that the cast belongs to one of the Aquatic carnivores. Not 

 far from the brain was found a sacrum, which is described 

 above as belonging to some carnivore, though further de- 

 termination was impossible. Whether there was any con- 

 nection between the two is difficult to state. The presence 

 of an aquatic carnivore in the Bridger eocene is new to 

 science ; but, aside from this, the brain is of a much higher 

 order than previous discoveries would lead us to expect in 

 such an early formation. 



Professor Marsh's researches have led him to form the 

 opinion that the eocene mammals had brains of a low charac- 

 ter ; but this specimen shows that this is not true of all, if it is 

 of most of them. The convolutions are not only numerous 

 and well marked, but they are complicated, showing the 

 transverse as well as the longitudinal folds. To such an extent 

 is this true that the brain will bear comparison with the 

 very highest modern carnivorous types. 



We hope to be able to give further notes upon this inter- 

 esting specimen at a later date. 



