THE CARBONIFEROUS ROCKS OF CANONBIE, DUMFRIESSHIRE, ETC. 761 



Ptilophyton plumula, Dawson, sp. 



1873. Lycopodites plumula, Dawson, "Rept. on Fossil Plants of Lower Carb. and Millstone Grit Forms 

 of Canada" (Geol. Survey of Canada), p. 24, pi. i. figs. 7-9. 



1878. Ptilophyton plumula, Dawson, Canadian Nat., vol. viii. No. 7, Feby. ("Notes on Scottish 



Devonian Plants," p. 7). 



1882. Ptilophyton plumula, Dawson, Fossil Plants of Devon, and Upper Silur. Forms of Canada, p. 121 



{Geol. Survey of Canada). 



Locality. — Glencartholm , Eskdale. 



Schutzia, Geinitz. 

 Schutzia, sp. 



1883. Schutzia, sp., Kidston, Trans. Roy. Soc. Edin., vol. xxx. p. 545, pi. xxxi. figs. 10-12. 

 Localities. — Tweeden Burn and Kershope Burn, Liddesdale. 



Bythotrephis, Hall. 



Bythotrephis gracilis, Hall. 

 (Plate I. fig. 3.) 



1843. Fucoides gracilis, Hall, Nat. Hist, of New York, " Geol. of New York,'' part iv., Survey of Fourth 



Geol. District, p. 69, fig. 14. 

 1848. Buthotrephis gracilis, Hall, Nat. Hist, of Nexo York, "Palseont. of New York," vol. i. p. 62, 



pi. xxi. fig. 1. 

 1852. Buthotrephis gracilis, Hall, ibid., vol. ii. p. 18, pi. v. figs, la, lb, lc. Id. 



1884. Buthotrephis gracilis, Lesqx., Indiana Dept. of Geol. and Nat. Hist. Vith Annual Report, part ii. 



p. 30, pi. i. figs. 6,7 (? fig. 1). 

 1869. Bythotrephis gracilis, Schimper, Trait e d. paleont. veget., vol. i. p. 198. 

 1852. Bythotrephis gracilis, var. intermedia, Hall, Nat. Hist, of Nc/r York, "Palasont. of New York," 



vol. ii. p. 19, pi. v. figs. 2a, 2b. 

 1852. Bythotrephis gracilis, var. crassa, Hall, ibid., vol. ii. p. 19, pi. v. figs. 3a, 36, 3c, 3d. 



1879. Palxophycus gracilis, Lesqx., Coal Flora, vol. i. p. 11 (? pi. b, figs. 9-10a). 



1883. Chondrites Targioni, Kidston (non Brongt.), Trans. Roy. Soc. Edin., vol. xxx. p. 548. 



Remarks. — The specimen figured on pi. i. fig. 3 was originally identified as 

 Chondrites Targioni, Brongt.,* and there is really no character by which some of the 

 forms of Bythotrephis gracilis, Hall, can be separated from Chondrites Targioni, 

 Brongt., but experience has shown that the change which has taken place in the flora 

 of the palaeozoic rocks make it most improbable that any palaeozoic species passes into 

 the later strata which yields Chondrites Targioni. Hence, as already mentioned,+ the 

 palaeozoic species of the type of Chondrites Targioni are now placed in a separate 

 genus. 



The form of the plant collected at Borron Point, Arbigland, agrees with Hall's 



* Hist. d. vtfget. foss., p. 56, pi. iv. figs. 2-6. • t Ante, p. 743. 



