AEACHNIDES— ARANEIDES. 49 



Percentages of groups of Tertiary spiders in Europe and America, excluding those found in amber. 



The excess of proportion in America of Orbitelarise is here nearly as 

 great as is shown in the former table, but is not so great as the now height- 

 ened proportion in Europe of Retitelarige, while the Tubitelariae are now 

 the ones in which tlie proportion is similar in each, the Laterigradge the 

 only one where the proportion remains nearly the same as before, and the 

 Saltigradaj are nearly lost sight of in Europe, a single species being known. 



If now we carry the analysis a little further we shall find more inter- 

 esting relations, as will appear from the following table, in which all the 

 groups represented in Europe are introduced, and both the total fauna and 

 the species from the strata tabulated : 



Number of species of Tertiary spiders found in Europe and in America, by families. 



VOL Xllt- 



