222 ON PLANTS IN THE LOWER OLD RED SANDSTONE OF SCOTLAND.
three inches long by about two and a half lines wide, with a lateral branch one inch long. The substance of the specimen is converted into a similar material to the foregoing, but is brown in colour, in- stead of black. Along the margins of the stem and branch are a series of delicate horizontal processes given off at right angles. We believe this to be a Psilophyton allied to P. princeps, Dn.
(c) Green Burn, Keltie Water, 1^ miles S. of Gartmore, Stirling- shire. A micaceous sandstone full of linear vegetable fragments, one specimen not unlike some examples of Pinnularia, Dn.
(d) Keltie Water, above Chapellarroch, 1 mile S. by W. of Gartmore, Stirlingshire. Portions of plants, probably stems, one having a very Lepidodendroid appearance, although leaf-scars were not discernible.
(e) Keltie Water below Brackland Linns, 1| mile E. of Callander, Perthshire. Fragmentary remains.
(/) Quarry at Karnes Farm, 4 miles S. by E. of Callander. Frag- mentary remains.
(g) Quarry at Easterhill, 1-i- mile E. of Gartmore, Perthshire. A stem three and a half inches long, giving off subalternate branches, two on each side, and in general appearance very closely resembling Psilophyton robustius, Dn.
(It) Quarry in Cameron Plantation, near Alexandria, Dumbarton- shire. A grey flaggy sandstone crammed with plant-remains vary- ing from mere comminuted fragments up to large specimens. There is one specimen in the collection, probably a stem, nine inches long by nearly one inch and three quarters broad, and at one end be- tween four and five lines thick. Internally it is a sandstone cast ; externally the vegetable matter is converted into the usual black bituminous substance. There is also a small stem of Psilophyton resembling that from locality b.
(i) Turnpike road at Overballoch, Loch Lomond, Dumbartonshire. Sandstone resembling that at the last locality, and similarly yielding fragmentary remains.
