OllVEE ON THE ATLANTIS HYPOTHESIS. 16l 



In the Northern States, according -to Dr. Gray,* 218 (10-3 per 

 cent.) are shrubs or woody vines, and 130 (6'2 per cent.) trees. 



]VIr. Lesquereux mentions the folloAving genera as having been 

 identified in North American Tertiary beds.f Probably Miocene 

 plants, from Vancouver and BeDingham Bay, "Washington Territory — 



Populus 

 Sahx 

 Quercus 

 Planera 



Picus ? 



Cinnamomum 



Persoonia 



Diospyros 

 Acer 

 Platanus ? 



Salisburia 



Chamserops 



Sequoia. 



From Pleiocene beds, Tennessee : — 



Laurus, Prunus, Quercus, Fagus, identified with recent species of 

 South Florida, and the Gulf of Mexico : and from Pleistocene beds, 

 Kentucky, — Quercus, Castanea, XJlmus, Planera, Prinos, Geanothus, 

 Carya, Gleditschia, Acorus, all recent forms now found along the 

 Atlantic coast. In the Vancouver beds Proteaceae are dominant. 



Prof Goeppert mentions the following genera as having been 

 found in the Miocene beds in Alaska and the neighbouring Aleutian 

 Islands,! Gaulinia, Salix, Alnus, Taxodium dubium, (probably also 

 found in Kamtschatka), Sequoia, Juglans ?, Populus. 



Belation of the Japanese Flora, also that of the Old World 

 generally, to the Flora of the Eastern States of North America. — 

 The general relations of the Plora of Japan and also those of the Plora 

 of the Northern States have been most ably discussed by Prof Asa 

 Gray. Theformerinapaperinthe Memoirsof the American Academy,§ 

 the latter in Silliman's Joui-nal. || For much interesting detail I must 

 refer to these valuable essays, from the last-named of which I borrow 

 the following facts referring to the Flora of the Northern States, not 

 having, myself, tabulated the recent European and American Floras 

 with a view to bring out their analogies and difierences farther than 

 is noticed under previous heads. According to Dr. Gray there are 

 321 species (Dicots. 180, Monocots. 141) common to the Northern 

 States and Europe out of a total phanerogamous Flora in the 

 former of 2091 species (Dicots. 1490, Monocots. 601). If closely 

 representative be added to identical species, this number would be 

 raised to about 435, or over one-fifth of the whole, while, on the 

 other hand, but about 114 species (of 92 genera) are represented by 

 identical or strictly analogous species on the Oregon and Californian 

 side. 326 Northern United States genera belong to Europe, but 

 of these 284 are difiused over the greater part of the Northern 

 Hemisphere. 



Compared with Europe the Northern States are rich in ordinal 



* Sill. Journ., Ser. ii., xxiii. 374. f Sill. Joiivn. 1859, i. 359. 



% Bull. Ac. Imp. St. Petersburg, iii. 448. § N. Ser. vi. 377. 



II Ser. ii. xxii. Sept. 1856. 



