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. 



