JEFFREY: NEW ARAUCARIAJs. 327 
"With tlie foregoino- description of the external features of our fossil 
we may now pass to the consideration of its internal structure. 
The preservation of the tissues left much to be desired, but by the 
examination of a considerable number of sections, data were reached, 
which make it evident that in the present specimen we have to do with 
a new and very interestino; Araucarian genus. Fig. 4 (PI. 32), shows 
the wood of the trunk under moderate magnification. In no case was 
it found profitable to employ very high magnifications of the histologi- 
cal structure, on account of the somewhat unsatisfactory condition 
of preservation. Fig. 4 illustrates the transition from one annual 
ring to the next. It is to be observed that the autumnal pause in wood 
formation is very sliglitly marked, much less so than we have observed 
to be the case in Cretaceous material from the eastern United States. 
The rays do not stand out clearly in the transverse section, since they 
are indifferently preserved. Certain dark spots occur throughout 
the field of the photograph, which do not, as might be supposed, repre- 
sent resiniferous parenchyma, but merely carbonized aggregations, 
such as are not infrequent in petrified woods. Fig. 5 (PI. 32), shows 
the radial section of our wood, which indicates very clearly the indiffer- 
ent condition of preservation. The pitting, however, is clearly that of 
Araucarioxylon and as in that type the pitted regions are not coincident 
with the whole surface of the tracheids but are distinctly localized 
towards their ends, as in the woods of the living x\raucarian genera, 
Agathis and Araucaria. The same carbonized blotches as are appar- 
ent in the transverse section can also be made out in the radial view. 
The rays have not been shown, as their condition of preservation as 
seen in this plane is indifferent. By looking over a considerable 
number of preparations, however, it was possible to discern that the 
ray cells had numerous pits on their lateral Avails and apparently were 
entirely devoid of pits on their terminal and horizontal wall, precisely 
as is the case in the rays of the living Araucarian genera. Fio-. 6 
(PI. 32), show^s the tangential view of a less badly preserved portion 
of the wood. It can be made out that the rays are strictly' uniseriate 
and from two to eight or nine rows of cells in height. Evidence of 
tangential pitting of the autumnal tracheids was rather dubiously 
discerned. The condition of presen-ation left always some uncertainty 
on this point. It will be seen from the description of the wood of our 
specimen given in the above lines, that it represents a quite typical 
Araucarioxylon. The frequently rounded pits of the Brachyoxylon 
