528 



These plants are arranged in different strata, as follows : — 



Sppciea 

 Cambrian, Sihinan, Devonian, and Old Red Sandstone (older 



and middle Palaeozoic) ------- 73 



Carhoniferous --------- 683 



Lower Red Sandstone (Permian) - 76 



Magnesian Limestone .._.-._ 21 



Upper New Red Sandstone ------- 38 



Shell Limestone ..-.---- 7 



Variegated Marls --------- 70 



Lias -.---- 126 



Upper, Middle, and Lower Oolite (Jurassic) - - - - 168 



Wealden (Wealden Clay, Hastings Sandstone, Pembroke Beds) 61 



Chalk (Greeusand) - 122 



Tertiary Eocene -....--_ 414 



„ Miocene - - - - 496 



„ Pliocene .-..___ 35 



Diluvian .-.-..---- 31 



Fossil species 2421 



After alluding to Sir Charles Lyell's observations on the Flora of 

 the Carboniferous Epoch, as given in his late introductory discourse 

 to the Geological Society, Dr. Balfour referred to Raulin's account of 

 the Flora of the Tertiary Epoch in Central Europe. By this it ap- 

 pears that : — 



1. The Eocene Flora is composed of 127 species, of which 115 be- 

 long to Algaj, Characea;, Ulvaceae, Palmae, Naidaceae, Malvaceae, 

 Sapindaceae, Proteaceae, Papilionacea3, and Cupressineae. 



2. Miocene Flora, 130 species, of which 69 are Algae, Palmae, Naia- 

 daceae, Apocynaceae, Aceraceae, Plataneae, Lemnaceae, Papilionaceae, 

 Quercineae, Myricaceae, and Abietineae. 



3. Pliocene Flora, 259 species, of which 222 are Algae, Fungi, mos- 

 ses, ferns, palms, Ericaceae, Ilicineae, Aceraceae, Celtideae, Rhamneae, 

 Papilionaceae, Juglandaceae, Salicineae, Quercineae, Betulineae, Tax- 

 ineae, Cupressineae, and Abietineae. 



The Eocene species are allied to genera now found in intertropical 

 regions — India, Asiatic Islands, and Australia. Some are peculiar to 

 the Mediterranean region. The aquatics, which form nearly one- 

 third of the Flora, are related to genera now found in temperate 

 regions of Europe, and in North America. 



The Miocene species belong to genera found now in India, tropi- 

 cal America, and other intertropical regions, but of which the greater 



