LAERENTIAN AND EARLY PALAEOZOIC. 



23 



ave more recently named it, Nemaiophyton, as a prime- 

 val gymnosperm allied to those trees which linger had 

 described from the Erian of Thuringia, under the name 

 Aporoxylon.* Later examples of more lax tissues from 

 branches or young stems, and the elaborate examinations 

 kindly undertaken for me by Professor Penhallow and 



FIG. 4. Nematophytou Logani (magnified). Eestoration.t 



eferred to in a note to this chapter, have induced me to 



aodify this view, and to hold that the tissues of these 



igular trees, which seem to have existed from the be- 



* " Palaeontologie des Thuringer Waldes," 1856. 

 f Figs. 2, 3, and 4 are drawn from nature by Prof. Penhallow, of 

 cGill College. 



