RESTORATIONS. 1G7 



The reniarka))ly small brain, and the heavy massive limbs, indicate 

 a dull, slow-moving animal, little iitted to withstand sudden chang-es in its 

 environment, and lienoe it did not survive the alterations of climate with 

 which the Eocene period closed. 



That the Dhiocrrata were very abundant for a long- time during the 

 middle Eocene is proved, conclusively, by their numerous remains in 

 deposits of this age. That the animals lived in herds is also suggested by 

 the position in which the remains are found. Their favorite resorts would 

 seem to have been around the borders of the great Eocene tropical lake 

 described iu the Introduction of the present volume. Here, they found 

 an abundance of food, which was evidently the soft succulent vegetation 

 which flourished, then as now, in such localities. 



In Tinoceras, represented in Plate LYI, Ave liave the skeleton of a 

 larger, and still more imposing animal, but with essentially the same 

 characteristics. The remains of this genus are found in the same 

 lake-basin as those of Dinoceras, but at a higher level, and the evidence 

 is clear that Tinoceras is a later, and more specialized form. 



Both the animals chosen for these two restorations were evidently 

 males, as shown by the lofty protuberances, or horn-cores, on the skull, 

 and the powerful canine tusks. In the females, these parts are but 

 feebly developed, as seen in the specimens described in the preceding 

 chapters. The individuals here restored were certainly thrice-armed, and 

 well fitted to protect themselves, and their weaker associates, from any 

 of their Eocene enemies. 



The exact form and nature of the off"ensive weapons which surmounted 

 the head of the Dinocerata cannot, at present, be determined with certainty. 

 That the paired osseous elevations on the skull in all the known species 

 of this group did not supjjort the kind of horns seen in the tyjjical 

 Ruminants is evident from their external surface, which lacks the vascular 

 grooves so distinct on the horn-cores of those animals. 



