362 Proceedings of the Royal Physical Society. 
arranged in concentric lines which become more numerous, 
smaller, and closer together as they approach the periphery 
of the stem. 
Locality —Reswalhe, near Forfar. 
Horizon.—Lower Old Red Sandstone. 
The specimen is in the collection of the Geological Survey 
of England, Museum, Jermyn Street, London. 
Remarks—I1 am unable to determine the affinities of this 
fossil. At first sight Cryptoxylon has somewhat the appear- 
ance of Kalymma unger; but here the stem is described as 
having a circle of slightly separated bundles protected by an 
outer bark, and towards the centre of the stem, and within 
the outer circle of bundles, a second series of more distant 
and somewhat irregularly-shaped bundles occur, which are 
also placed roughly in a circle. The minute structure of the 
elements composing these bundles does not seem to be clearly 
made out, though Sir William Dawson and Professor Pen- 
hallow state that “in one case a single cell shows fine 
transverse bars, possibly the remains of a spiral, annular, or 
scaliform structure.” ? 
Though the full structure of the “bundles” in Kalymma 
is imperfectly known, still they are composed of elongated 
tissue. In Cryptoxylon there are no bundles or vascular tissue 
of any kind, and the little dark “spots” seen by the unaided 
eye in transverse and longitudinal sections are only formed 
of groups of cells, smaller than those of the surrounding 
matrix. 
From Prototaxites, Dawson (Nematophycus, Carr.), it is 
essentially distinct. In Prototaxites the tissue is entirely 
composed of long felted tubes. 
That Cryptoxylon is cryptogamic is evident, and though the 
stem is entirely composed of cellular elements, this does not 
appear to me to be sufficient evidence on which to conclude 
1 Beitrage zur Paliontologie des Thiiringer Waldes—Denk d. Math.- 
Naturwissen classe d. k. Akad. d. Wissensch, vol. xi., 1856, p. 71. 
2 Kalymma grandis. Note on specimens of fossil wood from the Erian 
(Devonian) of New York and Kentucky—Canad. Record of Science, vol. iv., 
January 1891, plate i. 
