118 MR. E. A. NEWELL ARBER ON TRIASSIC SPECIES 
There are, however, several other genera with which these leaflets, and especially 
imperfect, detached fragments of the pinne, are liable to be confused, and these may 
be briefly noticed. 
Neggerathia, Sternberg.—This genus is now restricted to certain leaves, known only 
from the Westphalian rocks of Bohemia, of which W. foliosa, Sternb., is the” typical 
species. Its affinities are wholly uncertain. The only specimens of Zamites grandis, 
which might be confounded with it, are short basal fragments of the leaflets, which are 
easily distinguished by the callosity at the point of attachment, and by the sudden con- 
traction in width at the proximal extremity. 
Cordaites, Unger (including Rhiptozamites, Schmalhausen).—Some imperfect frag- 
ments of the leaflets of Zamites grandis recall rather vividly certain leaves of Cordaites, 
but when complete pinne are available they are easily recognised by the basal 
characters, and also by the fact that they are the leaflets of a pinnate frond, and not 
leaves spirally arranged on a shoot. 
_Neggerathiopsis, Feistmantel.—In the case of this imperfectly-known member of the 
Glossopteris flora, probably closely allied to, if not identical with, Cordaites, where the 
manner of attachment of the leaves is as yet undetermined, the detached pinnz of 
Zamiles grandis are with difficulty distinguished, and then chiefly by their basal 
characters. It is possible that the fossils from the Rhetic rocks of Tonkin, referred to 
N. Hislopi by Zeiller*, may be fragments of leaflets of a Cycad-like frond with long 
pinnz, but the matter must remain doubtful for the present. One of Zeiller's figures, 
however, shows a distinct basal callosity. 
Podozamites, Bronn.—The species of this genus with long leaflets are easily 
distinguishable from Z. grandis, by the fact that the pinne are much more 
narrowly contracted at the base, and the veins less numerous and less crowded. The 
manner of arrangement of the leaflets on the axis or rachis is also a distinctive 
feature. 
It has been seen that, on the interpretation of the Triassic fossils discussed here, there 
are good reasons for regarding as portions of Zamitean fronds with very long pinne 
several other, previously described examples (see pp. 115-116) from rocks of various ages, 
hitherto assigned to such genera as Yuccites and Cordaites, some of which have been 
attributed with confidence to the class Monocotyledons. ‘The list could be considerably 
extended. The fossils figured by Heer, and more recently by Leuthardt f, from the 
Keuper of Neue Welt, near Basle (Switzerland), under the name Bambusium Imhoff, 
Heer, of which I have seen an example in the Basle Museum, are almost certainly 
pinne of a Zamitean frond, and may even be identical with, or closely related to, Zamites 
grandis. This again, in the opinion of Dr. Leuthardt in his recent memoir, is an example 
of a Triassic Monocotyledon. | 
It is possible that some of the leaves now assigned to the genus Phenicopsis, Heer, 
more especially P. elongatus (Morris) from the Rheetic of New South Wales and 
* Zeiller (1902), p. 149, pl. 40. figs. 1-6, 27-8. F Leuthardt (1903), pt. 1, p. 6, pl. 1. figs. 1-3. 
+ Seward (1903), p. 67, pl. 9. figs. 1, 9, 10. 
