O74 OLDER MESOZOIC FLORAS OF UNITED STATES. 
in a single series, or rarely in two series. In the Richmond Basin speci- 
‘men there is one, rarely two, and very rarely three series. When in 
a single row they are approximately circular; when in two or three 
rows they are very slightly compressed and hexagonal. 
In tangential section the ends of the medullary rays are of course 
shown. They are seen to be composed of from 1 to about 12 super- 
imposed cells. The wood cells as seen in this section are without the 
bordered pits that form so important a character in A. arizonicum. 
As I took occasion to say in my report on the Richmond Basin 
material, this species is very closely allied to, if not indeed: identical 
with, Araucarioxylon arizonicum, differing in having a less number of 
cells in each medullary ray, and particularly in the absence of bordered 
pits in the tangential walls of the wood cells. These are, however, not 
important differences, and a larger series of specimens might show the 
breaking down of this character, but for the present, at least, it may 
be regarded as distinct. 
Locality.—Road between Walnut Cove and Germantown, North 
Carolina; collected by I. C. Russell, August 21, 1885. Near Lock- 
ville, North Carolina, collected by I. C. Russell, July 25, 1885. 
ARAUCARIOXYLON VIRGINIANUM Knowlton. 
Pl. XXXVII, Figs. 1-6. 
1889. Araucarioxylon virginianum Kn.: Bull U. 8. Geol. Survey, No. 56, p. 50, pl. vii, 
figs. 2-5. 
1899. decsierceein virginianum Kn.: Nineteenth Ann. Rept. U.S. Geol. Survey, Pt. 
II, p. 516, pl. lii, figs. 7-10. 
As stated above, this species was described from what was thought 
at the time to be Potomac strata, but which later investigation has 
shown to be undoubted Triassic. It was also detected in the Richmond 
‘Basin, as mentioned in my report on that material. Its presence is 
now demonstrated in the Triassic area of North Carolina. ' 
On comparing the drawings here given with the original figures, it 
will be seen that the agreement is very close indeed. The medul- 
lary rays have about the same number of cells and the same charac- 
ters. The pits on the radial walls of the wood cells are identical. 
When the pits are in a single row they are less evidently hexagonal, 
but when in two rows they are distinctly so. I therefore do not hesi- 
tate to refer the specimen to this species. 
Locality.—Lockville, North Carolina; collected by I. C. Russell, July 
25, 1885. 
THE EMMONS COLLECTION. 
On the evening of March 28, 1894, at the close of a meeting of the 
Geological Society of Washington, before which I had read a paper on 
