LAUREXTIAN AND EARLY PALJIOZOIO. 



23 



have more recently named it, Nematophyton, 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 



Fio. 4. — Nematophyton Logani (magnified). Restoration. t 



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

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

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



* " Palacontologic des Thuringcr Waldes," 1856. 

 f Fig.s. 2, 3, and 4 arc drawn from nature by Prof. Ponhallow, of 

 McGill College. 



