THE EXTINCT LAKE OF BOVEY TRACEY. 
195 
€& p. 256, 1872), a Post-Miocene depression might have carried 
the hypothetical Atlantis into almost abyssnial depths. But 
an Atlantis is apparently unnecessary and uncalled for. According 
to Professor Oliver, "A close and very peculiar analogy subsists 
between the Flora of Tertiary Central Europe and the recent 
Floras of the American States and of the Japanese region; an 
analogy much closer and more intimate than is to be traced 
between the Tertiary and recent Floras of Europe. We find the 
Tertiary element of the Old World to be intensified towards 
its extreme eastern margin. . . . This accession of the Tertiary 
element is rather gradual and not abruptly assumed in the Japan 
islands only. Although it there attains a maximum, we may trace 
it from the Mediterranean, Levant, Caucasus, and Persia . . . 
then along the Himalaya and through China. . . . We learn also 
that during the Tertiary epoch, counterparts of Central European 
Miocene genera certainly grew in North-west America. . . . We 
note further that the present Atlantic Islands Flora affords no 
substantial evidence of a former direct communication with the 
main land of the New World. . . . The consideration of these 
facts leads me to the opinion that botanical evidence does not 
favour the hypothesis of an Atlantis. On the other hand, it 
strongly favours the view that at some period of the Tertiary 
epoch North-eastern Asia was united to North-western America, 
perhaps by the line where the Aleutian chain of islands now 
extends." (Nat. Hist. Rev. ii. 164, 1862.) 
According to Professor Heer the genus Sequoia, so far as is at 
present known, included seven species, two of them — S. gigantea 
(sometimes termed Wellingtonia) and S. sempervirens — are living 
in California, while the remaining five are fossil species restricted 
to Tertiary deposits. When arranged in the order of their 
affinities they stand as below : — 
1. & gigantea. 5. S. hardtii. 
2. S. ehrlichi. 4. S. couttsiai. 6. S. langsdorfi. 
3. S. st ember gi. 7. S. 'sempervirens. 
the living species being the extremes of all the known forms, and 
each of them having two of the fossil species closely related to 
them, while S, couttsice — the Bovey species — is the intermediate 
species between the two principal types. (Phil. Trans, li. 1053.) 
