Bd. III: 14) 
THE MESOZOIC FLORA. 
17 
which is truncate with a slightly concave outline. The venation appears to be more 
radiating than in the other pinnules. This peculiar development of the lower basal 
pinnule is the most important character of C. lobifolia. The other pinnules are 
longer, deltoid to ovate or lanceolate with the upper edge retreciated at the base, 
the lower one somewhat decurrent. They have more or less acute apices and entire 
or nearly entire margins. The venation is indistinct, but appears to be of the usual 
Cladophlebis-\.y^&. 
The specimen is sterile and the name Cladophlebis has accordingly been used 
here. Although fertile specimens are known, their exact affinities are not quite 
settled. Generally they are regarded as closely allied to Dicksonia, but to refer 
the species to the latter genus is certainly too rash. Fertile specimens from York- 
shire have recently been examined by Thomas (/. c.) and referred to a new genus, 
Eboracia. They certainly should not be retained under Cladophlebis^ but deserve 
a separate name. 
Cladophlebis lobifolia is known from several districts in Europe, mostly in beds 
corresponding in age to the Lower Oolite. It has been recorded by Feistmantel 
(1877 0 p. 6; pi. 3, fig. I) from the Jabalpur Group of India and seems to be re- 
presented in the Rhætic of Tonkin (Zeiller 1903, p. 36; pi. 4, fig. i). It has re- 
cently been described by Seward (1911 A P- 4 G pl- 2, figs. 20—26; pi. 7, fig. 73) 
from Chinese Dzungaria. Cladophlebis hcterophylla Font, from the Kootanie P'or- 
mation of North America should probably be included in this species, too. At least 
the illustrations given by FONTAINE (1892, p. 493; pi. 84, fig. 2) and Ward (1905, 
p. 294; pi. 71, figs. 2i — 25) are indistinguishable from those of European specimens; 
also the peculiar development of the proximal basal pinnule of each pinna is the 
same. Although not even a comparison with Cladophlebis lobifolia has been made 
by the American writers, it seems fairly probable that the American specimens be- 
long to C. lobifolia, and that the name C- heterophylla FONT, should consequently 
disappear. 
Cladophlebis (Klukia.>) exilis (PiilLL.). 
"ri. I, fig. 25. 
Pecopieris exilis, PHILLIPS 1829, p. 148; pi. 8, fig. 16. 
Pecopteris obtusifolia, Lindley & Hutton 1835; pi. 158, fig. l. 
Pecopieris exilis, Bunbury 1851, p. 188; pi. 13, figs. 5 a, b. 
Klukia exilis, Raciborski 1890, p. 4; pi. l, figs. 17 — 19. 
This species is only represented by the one specimen figured in pi. i, fig. 25, 
which consists of a portion of a frond or pinna, without base and apex. The speci- 
men is bipinnate with a rather slender rachis which bears densely crowded, alternate 
3 — 122943. Schwedische Siidpolar-Expedition igoi — içoj. 
