402 THE PUERCO EPOCH. 



be honiologized with any convolution, representing rather the cerebral vault 

 of the lateral ventricle. Posterior to them the flat surface descends gently 

 without indication of corpora quadrigemina or other irregularity, and at a 

 distance about equal to the length of the oval bodies, begins to rise gently. 

 The cranium is broken here, and no cast of the cerebellum was obtained. 

 I may remark that the cranium from which this cast is taken is not 

 crushed, and that it consists of parts of the parietal and squamosal bones 

 only. The latter remain as far as the incurvature to the pterygoid pro- 

 cesses in front of the glenoid cavity. 



MeasurementH of brain. 



M. 



Length from posterior rise to base of olfactory lobes 037 



Length of oval bodies of hemispheres 018 



Width iif proximal part of olfactory lobes 027 



Width of olfactory peduncles 021 



Length from olfactory lobes to oval bodies of hemispheres 005 



Diameter of hemispheres at posterior p.art of oval bodies 038 



Depth from sagittal crest to olfactory lobes 024 



Restoration — This remarkable animal was about the size of the col- 

 lared peccary, though the skull was perhaps a little larger. It must have 

 had a peculiar appearance, and unlike that of any known mammal. The 

 long legs with plantigrade feet must have given it the form of a bear, but 

 its very short neck is only paralleled by that of the elephant. Wliile the 

 shorter legs forbid near resemblance to that animal, and the shape of the 

 head is very different, yet the resemblances in the figure cannot be over- 

 looked. It had a long tail, stout at the base. It was a smaller animal than 

 the Phenacodus primcevus, but the head was of near the same size. The 

 dental system does not furnish any weapons of offense or defense, and none 

 are known from any other part of the skeleton. Its habits were omnivor- 

 ous, judging again from dental characters. It is the most abundant mam- 

 mal of the Puerco, and to this time the largest discovered. 



The large variety already mentioned is less abundant than the typical 

 form, three individuals only having been sent by Mr. Baldwin. The speci- 

 mens are frequently weathered from the rock matrix so as to be in beautiful 

 condition. 



