OLIVEE ON THE ATLANTIS nTPOTHESIS. 157 



The nine largest orders of the Swiss Tertiary are marked f iu the 

 above list. 



According to Professor Heer,* the recent Flora of Switzerland 

 includes 24 natural orders with ligneous species,t of which IS are 

 common to the Tertiary beds. J These latter are — Coniferae, Amen- 

 taceae, TJlmaceae, Elaeagnese, Aristolochiaceae, Thymelese, Apocyneje, 

 Oleacese, Ericaceae, Caprifoliaceos, Araliacese, Cornaceae, Tiliace;©, 

 Iliciuese, Ehamnaceae, Celastraceae, Acerinese, Berberidea). Tliese 

 orders include in the recent Flora 152 species, in the Tertiary 

 253. In Britain there are about 1230 Phanerogamia (Dicots. 923, 

 Monocots. 307) referred to 479 genera (Dicots. 3(35, Monocots. 114), 

 and 88 natural orders (Dicots. 73, Monocots. 15). About 116 species 

 (9 per cent.) are ligneous. Of Bi'itish genera about 48 are common 

 to the Swiss Tertiary (Dicots. 37, Monocots. 11). 



The Bovey Tracey fossil remains Professor Heer has shown to 

 be pre-eminently characterized by Miocene species. § Out of 49 

 species which have been discovered, 20 occur iu Miocene beds on the 

 Continent. The Bovey Flora includes the following recent genera : 



Phragmites Laurus \ Nyssa\\ Gardenia'^ 



Sequoia Eucalyptus ? j Fterocarya ? Vitis 



Ficus Eugenia \ Vaccinium Anona\\ 



Quercus Celastnis j Andromeda Nymipli^a. 



Professor Heer points out that none of the Bovey species are 

 common to the Miocene of Iceland, and that, excepting Sequoia and 

 Quercus, the genera are also distinct. 



In Iceland there are, according to Dr. Lindsay's list (1860J, 426 

 Phanerogams (Dicots. 290, Monocots. 136) belonging to 159 genera 

 (Dicots. 119, Monocots. 40), and about 48 natural orders (Dicots. 

 39-40, Monocots. 8). The only woody plants are birch, willow, 

 juniper, and rose. Common to the Swiss Tertiary there are in 

 Iceland 



Gen. Orders. 



Dicots. . . . . 12 . . 19-20 

 Monocots. . . . ij . . Q 



The following genera occur in Tertiary beds in Iceland : — Spar- 

 qanium,Pinus, Sequoia, Betula, Alnus, Salix (rare), Corylus, Quercus, 

 Ulmus, Platanus, Acer {A. otopterix, being the commonest Tertiary 

 tree), Vitis, Liriodendron, Rhamnvs, Rhus, Juglans. 



The Tertiary and Japanese Floras, ^<?.— About 71 natural orders 

 are common to Japan and the Swiss Tertiary ; of these 51 are re- 

 presented by identical genera, accepting the determinations of ' ' Flora 



* 1. c. p. 38. 



t Exclusive of LeguminosEe, Eosaceje, Ranunciilacefe. 



X I have united some of Prof Heer's Orders for the sake of uniformity. 



§ Paper read before Royal Society, Nov. 21, 1861. 



II Very doubtful, especially the last two. 



