Bd. III; 14) 
THE MESOZOIC FLORA. 
53 
Oroville flora (Ward, 1900, 1905) also come near our species, but not near enough 
to raise the question of specific identity. As an illustration of the great resemblance 
of Pseudoctenis ensiformis to Ctenis it may be mentioned that a specimen of C. 
orovillensis FONT, from the same flora figured by Ward (1900, pi. 58, fig. 4) is 
almost indistinguishable from the former species except by the venation, which is 
regularly, though not very frequently, ana.stomosing. 
Pseudoctenis cfr. Medlicottiana (Oldii. & Morr.). 
1']. 6, figs. 9, 10. 
Pterophyllum Medlico/iiamim, Ol-DHAM & MORRIS ’.803, p. 21; pi, 15, fig. 3; pi. 7, fig. I. 
Ph’rophvllum Medlicottianum, FEtSTM.XNTEl, 1877 a, p. 59; pi. 43, fig. 2; pi. 4.^, fig. i. 
The specimens shown in pi. 6, figs. 9, 10, have been doubtfully referred to 
Pterophyllum Medlicottianum Oldh. & Morr., which, adopting Seward’s classi- 
fication, should be removed to Pseitdoctenis. 
There is no frond known with entire pinnæ: both specimens figured represent 
only rachises with the basal portions of some pinnæ still in position. The rachis 
was evidently very stout, but is completely flattened on the impression. The pinnæ 
appear to be at a great distance from each other; but this is not certain, since they 
are probably not all preserved and some evidently are represented only by narrow 
fragments. At the base of the specimen shown in pi. 6, fig. 9, there are seen some 
broader pinnæ which come quite close together. The pinnæ seem to be inserted 
obliquely, someway up on the upper side of the rachis. They are contracted towards 
the base but expand slightly just before joining the rachis. The venation appears 
very coarse; the distance between the veins is, at some distance from the rachis, 
about the same as in the preceding species; but the veins are thicker and the lamina 
between them is convex on its lower side so as to make the pinna appear coarsely 
ribbed on the impression. The veins are .seen to bifurcate occasionally; but there 
are no anastomoses in the portions of the pinnæ preserved. 
These specimens come very near Pterophyllum Medlicottianum in most respects. 
The coarsely ribbed aspect of the pinnæ and their constriction a little above the 
base are the most characteristic features of that species; and these are present in the 
Antarctic specimens, too. The only difference, and one which is rather striking at 
the first glance, is the much more distant position of the pinnæ in our specimens. 
Too much importance should not be attached to this character, however, since the 
distance between the pinnæ is known to vary greatly in these genera. The broader 
and more closely placed pinnæ at the base of the specimen in fig. 9 agree in this 
respect with such of P. Medlicottianum. 
