1904] JEFFREY—A FOSSIL SEQUOIA 327 
rather than to the stouter, shorter similar elements of S. sem per- 
virens. They may be seen on the outside of the summer wood in two 
contiguous annual rings. They contain a very small number of 
resinous globules. On the left of the figure is a longitudinal section 
of a vertical resin canal. 
In fig. 12 is seen a longitudinal section of a medullary ray of the 
species under consideration. The lateral walls of the ray which are 
in contact with the tracheids are characterized by so-called bordered 
pits, which owe their double contour to the fact that the outline of 
the pit on the side of the tracheid is different from that on the side of 
the medullary ray cell. The medullary ray of the present species of 
Sequoia is strikingly different from that of the two living species in 
features other than the crucial one of the lateral bordered pits. There 
are distinctly differentiated marginal cells, broader than the central 
cells and having two to three radial rows of pits instead of the single 
tow found in the central cells. The marginal cells are further par- 
ticularized by their undulating borders, the tops of the undulations 
corresponding to the walls of the tracheids. They present an addi- 
tional contrast to the central cells in the fact that they are generally 
without tanniniferous contents and often contain very large clino- 
thombic crystals, lodged in cysts derived from the cell wall. The 
Presence of crystals finds a parallel in the genus Abies among the 
Abietineae. STRASBURGER has noticed their occasional presence in 
Abies pectinata, I have found them to be very numerous in A. 
soneuced and fewer in A. grandis, A. bracteata, A. nobilis, and A. 
magnifica. In Abies the crystals may or may not be associated with 
a dark brown matrix similar to that found in the resin cells of cupres- 
Pa Woods and in the so-called crystallogenous cells which occur 
oo of many of the Coniferales; but I have not found them 
_ i cysts derived from the cell wall as they are in the fossil 
ae of Sequoia here described. Where the medullary rays are 
fect fep the specialized marginal cells, instead of constituting a 
our Tow on the upper and lower borders of the ray, as is shown in 
§- 12, may be present to the number of three or four rows. In 
Satie Specialized cells may also occur in the middle of the ray, 
cettain aly the case with the tracheidal cells in the rays of 
etineae. Another feature which differentiates our species 
