334 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
tion represented in Figs. 3, 4, 5, and 6 (PI. 33). The present species 
resembles superficially so far as it goes, very closely the Pinites Solmsi 
of Seward (Cat. Mesoz. Plants, Dept. Geol., Brit. Mus. [The Wealden 
Flora, Pt. 2, Gymnospermae], p. 196, pi. 18, fig. 2, 1900) much more 
in fact than it does the Prepinus statenensis of the present writer. 
Of the two short-shoots in the writer's possession the smaller one is 
much better preserved and moreover has attached to the upper or distal 
end the bases of a few fascicular leaves. Both the spur-shoots are 
considerably flattened by the weight supported through a great length 
of time, which on account of the entire absence of carbonization or 
petrification, they have not been able to resist. Fig. 9 (PI. 33), shows 
a transverse section through the lower portion of the smaller short- 
shoot. On the left a considerable part of the cortical tissues has been 
broken away but on the right, as well as above and below, the structure 
is complete. The woody cylinder of the short-shoot may readily be 
made out and it is possible to distinguish the presence of two or naore 
rows of resin canals in the ligneous tissues surrounding the pith. 
This is a feature of contrast to P. sfatcnen.sis, where only a single 
series of canals has been observed. (See Jeffrey, Ann. Bot., vol. 22, 
pi. 13, figs. 6, 7, 1908.) Fig. 7 (PI. 33), represents a portion of the 
wall of the fibrovascular cylinder as well as a little of the inner cortex 
from the same specimen. It is obvious from this that the wood 
represents only one annual ring. The resin canals which are clearly 
present in the wood are filled with tyloses. The single annual ring 
containing resin ducts occluded by tyloses, makes it certain that we 
have really to do with a short-shoot and not with an ordinary twig, 
in which tyloses would only occur in a rather old specimen with 
numerous annual rings, showing heartwood. This evidence only 
confirms that derived from the external aspect. The resin canals of 
the woody cylinder of the short-shoot are not only vertical but also 
horizontal. The latter canals join the vertical canals of the wood 
with one another radially and likewise with similar canals in the cortex. 
Both horizontal and vertical canals are likewise present in P. sfafcnensis 
(Jefl'rey, Ann. Bot., vol. 22, pi. 13, figs. 6, 7, 1908). Fig. 10 (PI. 33) 
represents a section through the middle region of the larger specimen. 
The woody cylinder is here represented where it is of greatest 
diameter and presents at the same time a thick zone of wood. The 
pith is cracked as a result of the long continued pressure to which 
the specimen has been subjected. The wood shows the numerous 
