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5^^ ' 
No. 9.— A NEW ARAUCARIAN GENUS FROM THE 
TRIASSIC. 
BY EDWARD C. JEFFREY. ^ 
In the early part of the year 190S, my friend Professor J. B. Wood- 
worth of the Geological Department of Harvard University, turned 
over to me for investigation a remarkable trunk, from the Triassic 
forest, south of Adamana, Arizona. The specimen to be described 
was collected by ]Mr. John B. Lewis, Jr., of Reading, Massachusetts, 
and by him presented to the Geological INIuseum of Harvard Univer- 
sity, whence it came into my hands through the kindness of Professor 
Woodworth. In December, 1899, Dr. Lester F. Ward, at that time 
paleontologist to the United States Geological Survey, made a report 
on the fossil forests of Arizona ("Report on the Petrified Forests of 
Arizona," Washington, 1900). More recently Dr. Ward returned to 
the same subject in one of the Monographs of the United States 
Geological Survey (Monogr. U. S. Geol. Surv., no. 48, 1905). Since 
the present investigation was completed, a large amount of material, 
some of it collected by Dr. Ward himself, from this region has come into 
my possession for examination, through the courtesy of Dr. David 
White and Dr. F. H. Knowlton of the United States Geological Survey, 
as well as through the kindness of my colleagues Professors W^olff 
and Woodworth. It represents a considerable variety of forms and 
promises to yield results of great interest to evolutionary botanists, 
which will be published subsequently. 
Fig. 1 (PI. 31) represents a photograph of about two thirds of the 
length of the petrified stem in my possession, reduced to one half its 
natural magnitude. The missing third of the specimen was used for 
the purpose of securing sections, showing microscopic structure, which 
were prepared with his usual skill, by Mr. James Lomax of the Lomax 
Paleobotanical Company, Bolton, England. On the right of Fig. 1, 
the specimen presents some adherence of the matrix in which the tree 
was included. Towards the left the surface of the trunk has become 
clear of the surrounding rock as a result of the weathering process to 
which it has been exposed. Externally the wood is a pale yellow or 
orange color, while inwardlv the natural dark brown hue of the silici- 
