Ed. III: 14) 
THE MESOZOIC FLORA. 
59 
but not very frequently. There is some difference between the specimens referred 
to this species in regard to the distance between the pinnæ (cf. fig. 24, pi. 7, and 
text-fig. 13 r); but it cannot be of much importance, since there are all sorts of 
intermediate stages. 
Of other Hope Bay Zainites-ioxm.s, Z. Anderssonii comes nearest to the pres- 
ent species. In the latter, the pinnæ are much longer and more linear, but the chief 
difference lies in the venation, which is much denser and more prominent. Of the 
Greenland Zaniitcs, which are stated above to present a certain parallelism to some 
of the Antarctic forms, Z. speciosus Hr. (/. c.) shows the nearest approach to this 
species. The latter is easily distinguished, however, not only by the insertion of the 
pinnæ, as set forth above, but especially by its very dense and occasionally bifurcat- 
ing veins. 
There is one other form, of a quite different geological age, to which Z. ant- 
arcticHS presents a marked resemblance, viz. the Triassic Z. yorkensis Font. (Ward, 
1900, p. 245; pi. 29, figs. I — 4) from Pennsylvania. In .spite of the difference in geo- 
logical age a specific identity might even be advocated. It is difficult, however, to 
