io6 
T. G. HALLE, 
(Schwed. Südpolar-Exp. 
The Hope Bay flora thus shows no peculiarities which can be regarded as 
direct effects of a cold climate and as due to the fact that it flourished in a district 
which now belongs to the Antarctic region. The above comparison with other 
Jurassic floras will have sufficiently demonstrated that there is a considerable affinity 
to some of them. Of the 42 forms which have been definitely determined, not less 
than 22 are identified with previously known species occurring in the Mesozoic rocks 
of other districts, whereas 20 are described as new. Of the rest, 5 forms have been 
more doubtfully referred to known species occurring elsewhere. These facts must be 
considered in face of the principles of classification adopted in this paper, viz. to 
prefer, in doubtful cases, the institution of new species to the identification with 
known ones. The number of new species must therefore be admitted to be com- 
paratively small. The close agreement of the Hope Bay flora with other contempor- 
aneous floras is also expressed in the fact that such species as are new belong, 
with one exception, to known generic types. The only form which occupies a position 
apart is the one referred to the new genus Schizolepidella^ of which the systematic 
position is entirely obscure. 
The close relation existing between the Jurassic flora of Graham Land and other 
contemporaneous floras is rather remarkable in regard to its remoteness from these 
floras. In the nearest continent. South America, there are no floras of any import- 
ance that can be considered contemporaneous with the Antarctic one. The Meso- 
zoic floras described from Argentina and Chile are mostly older, belonging to the 
Rhætic and Liassic and show no considerable resemblance to the Hope Bay flora 
(Zeiller 1875, Geinitz 1876, SzAjNOCHA 1 888, Solms-Laubach 1899, Kurtz 1901). 
The nearest comparable flora of any importance is one recently found by the writer 
north of Lago San Martin in Central Patagonia. It is not a rich flora, however, and 
it is considerably younger than the Hope Bay flora. It belongs to the transitional 
beds between the Jurassic and the Cretaceous — or perhaps entirely to the latter 
formation, if greater weight is laid on the evidence of the marine fossils, which is 
here, as on the same horizon in other districts, in discord with that of the floras. 
Only one species is common, viz. Splienopteris Goepperti^ mentioned above as one 
of the younger elements of the flora of Hope Bay. The fossil plants described from 
Peru by Neumann (1907), Salfeld (1910), and Zeiller (1910) are mostly younger, 
of the age of the Wealden. Some of Salfeld’S plants are held to be Jurassic; but 
the flora is rather poor. Finally it may be mentioned as a curious circumstance that, 
though the only with any degree of accuracy determinable Mesozoic plant-remains, 
a species of Dictyosamites, found in Tierra del Fuego is probably of about the same 
age as the Hope Bay flora, yet not even the genus is represented in the latter. It 
is thus seen that, of the nearest Mesozoic floras, there is none of sufficient import- 
ance or correspondence in age to permit of a comparison. 
