DE. HEEE ON THE EOSSIL ELOEA OE BOVET TEACEY. 
1055 
them longitudinally ; but they become quite hard and brittle in the air, and crumble if 
cut. They are then brown or black. The microscopical examination did not give me 
satisfactory results. I certainly recognized the elongated woody fibres, but in most cases 
I was not able to distinguish the structure of their walls, which is very obscure. How- 
ever, in some cases I saw pores, which are ranged in one row (cf. Plate LXXI. figs. 8 
& 9), and, further, the medullary rays, which are formed from a single row of cells (Plate 
LXXI. fig. 8). There is no trace of spiral or reticulated vessels. The structure of the 
medullary rays and of the fibres proves it to be coniferous wood. As Sequoia Couttsice is 
the only coniferous tree hitherto found in the lignite-beds of Bovey, and was the com- 
monest tree of that country, it is very probable that most of the wood belonged to it. 
B. Monocotyledones. 
Order I. GLUMACEJE, Bartl. 
Fam. I. Geamine^, Juss. 
1. Pheagmites, Trin. 
9. Pheagmites (enin-gensis, A. Br. 1 (Plates LXIV. fig. 1 LXV. fig. 13 a; and 
LXVIII. fig. 2.) 
Phr. foliis latis, multinervosis, nervis interstitialibus tenuissimis. 
Heer, Flora Tertiaria Helvet. i. p. 64, pi. 22. fig. 5, pi. 24. 
Only some small parts of leaves ; the determination is therefore uncertain. We 
observe very slender secondary nerves between the strong longitudinal nerves. We can 
count twelve of them, all equally strong, between two longitudinal nerves, while in 
Phr. ceningends the median nerve is always a little stronger. In the same layer (in 
the 17th bed of Bovey) there are also some indistinct remains of culms, which probably 
belong to these fragments of leaves ; likewise the pieces figured in Plate LXVIII. fig. 2, 
which all represent horizontal sections of culms. Fig. 2 a represents the section of a 
a knot, where, as in Phragmites communis., we have a middle part, which appears as a 
circular umbo, and around it the wall of the culm. 
2. PoACiTES, Br., 
10. PoACiTES, sp. (Plate LXVIII. fig. 3.) 
Bovey (Dr. Falconer). 
It is a thin, finely striated grass-culm, on which we perceive a knot. It is 2^ millims. 
in breadth. It is not sufiicient for a more exact determination, but seems to prove that 
small grasses existed in that country. 
7 E 
MDCCCLXII. 
