250 EXTINCT MONSTERS. 



well-established fact, that throughout most of the Tertiary era 

 the climate of northern latitudes was very much warmer than 

 now — in fact, sub-tropical. What cause, or causes, brought about 

 so great a change, we cannot stay to consider here. 



In conclusion, it only remains to express a hope that the 

 reader may have been interested in our humble endeavours to 

 describe some of the largest, most strange, and wonderful forms 

 of life that in remote ages have found a home on this planet. 

 And perhaps a few of our readers may be induced to add a new 

 and never-failing interest to their lives by searching in the stony 

 record for traces of the world's "lost creations." If so, our 

 labour will not have been in vain. 



