882 OLDER MESOZOIC FLORAS OF UNITED STATES. 
should select from near the fractured surface that could be easily 
detached without injury to the specimen. I had taken the precaution 
to obtain permission from the State School of Mines of Colorado to 
have sections cut in case this seemed advisable, and Mr. Wieland took 
to New Haven several detached fruits, which he has carefully exam- 
ined. While the proofs of this paper were passing through my hands 
I received a letter from him, dated March 17, 1900, giving the results 
of his investigations, which I am glad to introduce here as a fitting 
supplement to the above description, and as a welcome addition to our 
knowledge of this interesting specimen. Mr. Wieland says: 
I am unable to find even basal portions of fruits in the Boulder 
cycad, only the peduncles surrounded by very large bracts. The sec- 
tions made, even when quite thin, show the dense blackness and require. 
very careful polishing to reach the thinness requisite to bring out struc- 
ture. Each of those axes which seemed so much like fruits in a rather 
early stage is then seen to consist of a rather slender peduncle, sur- 
rounded by five or more bracts, whose transverse section is almost as 
large as that of the peduncle itself. The whole is deeply embedded in 
ramentum resembling that of the Wyoming cycads in the large num- 
ber of cells seen in transverse section. The bract ramental hairs are 
apparently thinner than those belonging to the leaf bases. The pedun- - 
cles are subequilateral-triangular in transverse section, the bracts the 
same, or in part of crescentic transverse section, with the horns of 
the crescent gracefully rounded. There are slight differences in the 
arrangement of the xylem and phloem of the peduncle, as compared 
with the Black Hills cycads, Cycadeoidea Paynet and C. Wielands, 
which I presume compare most nearly with this form in general out- 
line of the trunk and appearance of the fruiting axes. There is a 
strong suggestion that the fruits when mature must have hung well 
out from the trunk, very much as a Zamia angustifolia cone. 
Cycadeoidea nigra is certainly well named. The sections as thin as 
paper are still black. It is, moreover, a very distinct species—a very 
interesting cycad. I am sorry that I could not catch so much as a 
parenchymatous cushion. 
Pl. LXVIII shows the best side of the trunk and brings out the leaf 
scars with their arrangements and the reproductive organs very clearly. 
Pl. LXIX represents the vertical fracture and shows all that can be seen 
of the internal structure. The indistinctness at the summit is due to 
the oblique direction of the fracture at that point, sloping back from 
the camera so as to become out of focus. 
é ¥ 
JURASSIC CYCADS FROM WYOMING. 
A considerable number of fossil cycadean trunks have been obtained 
from the Jurassic of Wyoming. The locality is in what are called the 
