76 



THE CHAIN OF LIFE. 



in the Early Mesozoic, culminate in hundreds of beautiful species 

 in the middle of that era, and disappear for ever at its close, 

 leaving no modern successors. Many and beautiful species of 

 Ammonites and their allies have been obtained from the 



Fig. 72. — A//iHto»iUs yason{Reinecke). Jurassic. 



Mesozoic rocks of British Columbia and other parts of the 

 west coast of North America, perfectly representing this group 

 as it occurs at the same period in Europe, and closely resembling 



f^Vv 



'v 



Fig. 72a. — Suture ot Atnmomtes componens (Meek), ot British Columbia. Shoving 

 the complicated foldit.g of the edges of the chambers to give strength to the shell. 

 Cretaceous. 



^a 



the Mesozoic Ammonites of India. These animals have all 

 perished, yet the Atlantic and the Pacific roll between, apparently 

 with conditions as favourable for their comfortable existence as 

 those of any previous time. They perished long ago, at the 



