J. Romanes — The Peninsula of Nicoya, Costa Rica. 259 



marked uniformity that I am led to doubt the existence of any rocks 

 differing; much from those to be described. 



5. 



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Map of the Peninsula of Nicoya, Costa Eica. 



The rocks met with may be divided into three groups as shown 

 below, while in the second column are given the probable equivalents 

 on the mainland. 



The order of succession given above seems to me the most probable ; 

 however, as no actual junctions were found direct evidence is not 

 available, but as will be seen in the following pages there is considerable 

 indirect evidence to support it. 



