6o 
T. G. HALLK, 
(Schwed. Südpolar-Exp. 
form any clear idea of the venation and insertion of the pinnæ of the American 
species from the illustrations given; so for the present it seems better to treat the 
Antarctic form as a separate species. 
There may be described here a few other specimens which cannot with certainty 
be referred to /S', antarcticus, but which, on the other hand, are not sufficiently 
distinct to justify the institution of new species. The fronds shown in pi. 7, fig. 20, 
present a close resemblance to Z. antarcticus. They dift'er from other specimens of 
that species in having broader and more falcate pinnæ; the venation is that of Z. 
antarcticus. On the whole, the dififerences are hardly so important as to call for 
the institution of a new species, yet the difference in habit from typical members of 
the species is not to be denied. The fragment shown in pi. 7, fig. 28, also belongs 
no doubt to this form. 
The specimen figured in pi. 7, fig. 19, consists of the larger part of a fine frond. 
The pinna-base is of the Subzamites-\.y'Ç)&, the pinnæ are long, narrow and linear as 
in typical specimens of Z. antarcticus and the venation is typical, too. The pinnæ 
are somewhat falcate, however, and give the frond a rather different habit. Some 
of the pinnæ are less falcate and more like those of typical specimens of Z. ant- 
arcticHs. From the specimen in pi. 7, fig. 20, just described, which likewise has 
falcate pinnæ, the present frond differs by its long and narrow pinnæ, which are more 
like those of typical Z. antarcticus. It is very difficult to decide whether the spe- 
cimen should really be included in the latter species or not. 
Zamites pachyphyllus n. sp. 
PI. 7, figs. 14 — 16; pi. 8, fig. 1(7: text-fig. 14. 
The fronds shown in pi. 7, figs. 14 — 16, and in pi. 8, fig. i a, form together, 
though somewhat different, a very well characterized type to which has been given 
the name of Z. pachyphyllus. 
Frond narrow, linear, very gradually tapering towards the base. Pinnæ distant, 
attached to the upper surface of the frond at a wide or nearly right angle, and 
with slightly rounded bases. Pinnæ lanceolate to linear, very thick, upper surface 
convex, the lower concave; with a distinct, thinner margin; apex obtuse or acute. 
Of the specimens referred to this species, the two shown in figs. 14 and 15 are 
the counterparts of each other. This frond, characterized by very remote, nearly 
perpendicular, broad and obtuse pinnæ, may be regarded as the type of the species. 
The specimen seen in fig. 16 differs in having the pinnæ more closely set, more fal- 
cate, and acute at the apex. The fronds figured in pi. 8, fig. i have distant and 
