i8 
T. G. HALLE, 
(Schwed. Südpolar-Exp. 
pinnæ, forming nearly a right angle with the rachis. The pinnæ are lanceolate or 
broadly linear in shape, abruptly and bluntly pointed. The pinnules are attached 
to the rachis of the pinna by the whole of their bases and at a wide angle. They 
are free from each other, short linear or almost triangular, with a broad rounded 
apex. Each pinnule is traversed by a distinct but short and slender midrib, giving 
off arched lateral veins. The preservation of the specimen is not very satisfactory, 
and the venation is not well shown. 
In the absence of fructification the systematic position of the specimen must 
remain doubtful, and it is not certain that it is specifically identical with the fertile 
form, nained Kliikia by Raciborski and referred to the Schizæaceæ. As far as the 
vegetative characters are concerned, the resemblance is a very close one; but it is 
possible that some fronds of the type of Pccopteris exilis Phillips may have borne 
a fructification of a kind different from that of Klukia. The only difference in the 
characters of the sterile fronds between the Antarctic specimen and typical forms of 
Cladophlebis exilis seems to be that in the former the pinnæ of second order are 
comparatively short and more abruptly tapering. Some typical specimens belonging 
to that species, however, have the same shape of pinnæ, so, for instance, one figured 
by Raciborski (1894, pi. 8, fig. i): otherwise the resemblance to the English speci- 
mens is the closest, and there is good ground to believe that the Antarctic plant is 
specifically identical with PHILLIPS’ Pecopteris exilis. 
Cladophlebis exilis is especially characteristic of the Oolite. It is known from 
different districts in Europe, from Caucasus (Seward 1907, p. 4; pi. i, figs. 4 — 7; 
pi. 3, fig. A) and possibly from Japan (Yokoyama 1889, p. 35; pi. i, figs. 8 — 10), 
but not from the area of the old Gondwana-continents. 
Cladophlebis (?) sp. 
PI. 2 , fig. 4- 
The specimen figured in pi. 2, fig. 4, should apparently be placed in Cladophlebis ; 
but it differs considerably from the other members of that genus described above. 
The specimen represents the upper part of a frond of very open habit, the 
pinnæ being placed far apart on the slender rachis. The pinnæ are short, tapering 
gradually from the base to the apex and are directed obliquely forwards. They de- 
crease rapidly in size towards the summit of the frond. The pinnules are short, 
deltoid to lanceolate and sharply pointed. The exact mode of attachment cannot 
be seen; the pinnules are distinctly retreciated at the base, but probably not more 
than is consistent with the attribution to Cladophlebis. They are directed obliquely' 
forwards at a rather acute angle to the rachis of the pinna. The midrib of each 
pinnule is distinct and persistent. It gives off, on each side, 2—4 lateral veins. 
