THE CARBONIFEROUS ROCKS OF CANONBIE, DUMFRIESSHIRE, ETC. 743 



The genus Byihotrephis is now generally employed for the reception of palsezoic 

 Algae with simple or divided and branched fronds, the genus Chondrites being re- 

 tained for those of similar character which occur in more recent rocks. 



In the absence of any knowledge of the affinities of these fossils, this course has 

 much to commend it. 



Bythotrephis acicularis, Gdppert, sp. 



1852. Confervites acicularis, Gbpp., Fobs. Flora d. Uberyanys, p. 80, pi. xli. fig. 3. 



1850-56. Confervites acicularis, Sandberger, Vers. d. Rheinischen Schichtm, p. 122 pi. xxxviii. fig. 3. 



188G. donfervites acirularis, Kidston, dotal. Palseoz. Plants, p. 21. 



1894. Bythotrephis acicularis, Kidston, Proc. Roy. Phys. Soc, vol. xii. p. 238. 



Remarks. — The true nature of this fossil is very problematical. They appeal' to be 

 of vegetable origin ; and though they agree well with Goppert's figure and description, 

 the}' possess very little character on which to speak with certainty as to their identity. 



Locality. — Glencartholm. 



Bythotrephis plumosa, Kidston. 



1883. Chondrites plumosus, Kidston, Trans. Roy. Soc Edin., vol. xxx. p. 532, pi. xxx. fig. 3, pi. xxxii. 



fig. 2. 

 1894. Bythotrephis plumosa, Kidston, Proc. Roy. Phys. Soc. Edin., vol. xii. p. 238. 



Note. — Mr Seward has suggested that this fossil might be the fine roots of a water 

 plant, but I rather incline to the view that it is algoidal.* 

 Locality. — Glencartholm. 



Bythotrephis simplex, Kidston. 



1883. Chondrites simplex, Kidston, Traits. Roy. Soc. Edin., vol. xxx. p. 533, pi. xxxi. fig. 14. 

 1894. Bythotrephis simplex, Kidston, Proc. Roy. Plrys. So<\ Edin., vol. xii. p. 238. 



Locality. — Glen cartholm. 



Bythotrephis Scotica, Kidston. 



(Plate I. figs. 1 and 2.) 



1883. Bythotrephis, sp., Kidston, Trans. Roy. Soc. Edin., vol. xxx. p. 534 (-woodcut). 

 1886. Bythotrephis Scotica, Kidston, dotal. Palceoz. Plants, p. 22. 



Description. — Frond frequently dichotomising at an acute angle, segments of frond 

 generally contracted at point of dichotomy. 



Remarks. — When preparing the Eeport on the Fossil Plants from Bskdale and 

 Liddesdalef I had only imperfect specimens of this species, but of the best a wood- 

 cut was given. 



* Seward, Fossil Plants, p. 148, 1898. t Trans. Roy Soc. Edin., vol. xxx. p. 531, 1883. 



