330 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
of Professor J. B. Woodworth, to whom we are indebted for the 
material 
Woodworthia arizonica, genus et species nov. 
^Yood of the Araucarioxylon type, with ahernating radial pitting of 
the tracheids, generally grouped at the ends of the elements; short- 
shoots present, which persist through many years, probably as long as 
the axis, which bears them; leaf -traces subtending short-shoots and 
not persistent throughout the secondary wood as in existing represen- 
tatives of the Araucarineae; annual rings not strongly marked. 
Triassic forest near Adamana, Arizona. 
Conclusions. 
It will be apparent to the reader that in the case of the new genus, 
which is the subject of the present article, we have to do with a 
remarkable Araucarian type. Although it is not the first extinct 
Araucarian conifer known to possess short-shoots, since another type 
has been described from the Lower Cretaceous of Staten Island, 
N. Y., ("Araucariopitys, A New Genus of Araucarians," Bot. Gaz., 
vol. 44, p. 435-444, pi. 28-30, 1907) it is nevertheless the first to show 
the typical Araucarioxylon structure associated with the presence of 
short-shoots. Moreover, the large size of the trunk investigated in 
the present instance, leaves no doubt as to the persistence of the base 
of the short-shoot in the successive annual rings of the mother axis. 
It is clear from a consideration of the present very important genus. 
that the Araucarian line in its older representatives approximated 
more and more to the Abietineous type illustrated by Pinus and 
Prepinus. Both Araucariopitys and Woodworthia vouch for the 
soundness of this general conclusion. The evidence for the primitive 
presence of short-shoots in the Araucarian line (Woodworthia and 
Araucariopitys) as well as in the Abietineous series (Pinus and Pre- 
pinus) seems now to rest on a very firm basis. Moreover, this con- 
dition in the vegetative axes of the earlier Conifers affords a most 
satisfactory support to the conclusions reached by the greater number of 
morphologists as to the interpretation of the female cone of the Conifers 
in general. As is well known the present tendency is to regard the 
