BRONN's index PAL.EONTOLOGICUS. 33 



tion, however, presents many difficulties, so that a true and certain 

 arrangement is scarcely possible. The Nummulite strata are also 

 kept distinct, though the author has no doubt of their true position 

 in the eocene tertiaries. The Molasse, v, is placed between the middle 

 and upper tertiaries, its vertebrata corresponding more to the lower, 

 its shells to the higher position. 



The following table, which we have drawn up from these lists, con- 

 tains an approximation to the number of known fossil species in each 

 of the great divisions of the vegetable and animal kingdoms. Many 

 of these are, hov/ever, duplicates, which on a thorough revision of 

 the different families would require to be suppressed. Prof. Bronn 

 thinks that in the invertebrate classes the known species are perhaps 

 a fifth fewer than the names in his list. 



Vegetabilia. 



Plantae cellulares 773 



Plantse vasculares. 



Monocotyledones 1138 



Dicotyledones 725 



Organa plantarum, ^c 34 



Plantarum summa 2670 



Animalia. 

 Phytozoa. 



Pseudozoa 2 



Amorphozoa 462 



Polygastrica 672 



Polypi. 



Polythalamia 893 



Bryozoa 810 



Anthozoa 825 



2528 



Entozoa 



Acalephae 43 



Echinodermata 1 189 



Incert<2 classis 5 



4901 



Malacozoa. 



Gymnacephala 1 



Brachiopoda 952 



Rudistee 194 



1146 



Pelecypoda. 



Monomya 1066 



Dimya 3650 



4716 



Pteropoda 41 



Heteropoda 85 



Protopoda 120 



Gasteropoda 6110 



Cephalopoda 1452 



f2 -13,671 



