Bd. III: 14) 
THE MES(.)ZOIC FLORA. 
57 
separated by any intervening zone of exposed surface of the same. Their bases are 
very slightly oblique in respect to the axis of the rachis, with slightly rounded 
corners, and no callosity can be observed with certainty. The species should con- 
sequently be referred to the section Subzainites. The venation is open as com- 
pared with that of other similar forms in the collection, and bifurcation occurs only 
sparsely. At the apex, the pinna is strongly tapered, but rather obtuse than acute. 
This species may be said to form, together with the preceding and following 
ones, a series of evidently closely related forms, among which it occupies a central 
position. It may be asked, therefore, whether it would not be better to unite these 
three different forms in one species. They are separated by rather wide gaps, how- 
ever, and are always easily distinguished from each other. It is better, therefore, 
to treat them separately, so as not to impart a closer relationship than the one which 
undoubtedly exists. Zainites Aiiderssonii is distinguished from A. pusillus by its 
Fig. 12 . a — Zamites pusilbis n. sp.. b and c - Z. A/idersso/ui n. ?p.. V>. 
mostly longer and more tapered pinnae, and above all by the much more distant and 
parallel, and less prominent veins. From Z. autarcticns it differs in having shorter 
and more oblique pinnae, and more especially in regard to its open venation, as will 
be more fully set forth in the description of the latter species. 
Zamites Aiiderssonii shows, like the following species, a curious resemblance 
to some of the Z^wzV^’jr-fronds described by FIeer (1873, p. 63 and folk; pis. 14, 15) 
from the Lower Cretaceous of Greenland. These species (Z. speciosns Hr., Z. borea- 
lis Hr., Z. acutipennis Hr., Z. brevipennis Hr., and Z. arctiais Goepp.) form to- 
gether a fairly continuous series of forms, very much in the same manner as do the 
Antarctic fronds. The Greenland species do not belong to the Zamites-\.y\p& proper 
but to the somewhat different tyjje, for which the section-name Subzainites has been 
proposed above. Their pinnae are attached to the upper side of the rachis at a very 
wide angle, approximating to a right angle, their bases are very slightly rounded at 
the corners and strictly parallel to the axis of the rachis. The opposite pinnae do 
8 — 122943. Schwedische Siidpolar-Expedition igoi — igos- 
