f ' 

 9 



cylinder of porous discigerous fibres, with three rows of 

 contiguous pores, and radially arranged. This is of course 

 near to Dadoxylon. The stem and fruit have not hitherto 

 been recognised in Europe. 



These plants were first recognised in Prince Edward 

 Island by the writer in 1870, and published in his report on 

 the geology of the Island in 1871, under the generic name 

 ofKnorria. They are there stated to " resemble very closely 

 the Permian stems to which Eichwald has given the name 

 Schizodendron." They are also stated to show traces of 

 woody tissue allied to that of Conifers, and are conjectured 

 to have been branches of trees allied to that family. Jn 

 that Report they are said to occur in the Permo-Carbonif. 

 erous of Gallas Point, and also in beds referred to the 

 Trias. 



Additional specimens were subsequently collected by Mr. 

 Bain of North River, Prince Edward Island, and were sent 

 to me for examination. They are described in a paper pub- 

 lished in the Canadian Naturalist in 1885 as follows : 



"Tylodendron was founded by Weiss to include stems 

 with elongate, prominent leaf-bases of the character of those 

 of Knorria, but bifurcate at the top. These stems or 

 branches, are very characteristic of the Permian of Russia, 

 Germany and France. They have been found by Weiss to 

 show the character of Dadoxylon when the structures are 

 preserved, and are therefore Coniferous; and it is now 

 pretty generally believed that they are decorticated bran- 

 ches of Walchia. So far as European evidence extends, they 

 are regarded as strictly Permian, and the species drawn by 

 Mr. Bain is not distinguishable from T. speciosum of Weiss. 

 In Prince Edward Island, I have figured (Report, Plate III 

 Fig. 30) what seems to be the same species, though under 

 Knorria ; but my specimen may have been from the Middle 

 Series, then called Lower Trias, but now regarded by Mr. 

 Bain as Permian. 1 



1 Mr. Bain informs me in a recent letter that he has found speci 

 mens of Tylodendron in beds regarded by him as Triassic. 



