Nematophyton Ortoni, n. sp. 
BY 
D. P. PENHALLOW, 
McGill University , Montreal. 
M 
With Plate V. 
S INCE my last general summary of the genus Nemato- 
phyton 1 , two new species from Europe have been re- 
corded, one by Mr. C. A. Barber from the Tymawr quarry, 
near Cardiff, Wales, and named by him N. Storriei * ; the 
other from the shales in the neighbourhood of Grafrath on 
the lower Rhine, and designated by Count Solms-Laubach 
Nematophyton dechenianum 3 . 
I have now to describe a third, which differs in very im- 
portant respects from all previously recorded species, from 
the middle or upper division of the great Ohio shales. This 
specimen was obtained by Professor Edward Orton, of the 
Geological Survey of Ohio, from whom the facts relating to 
its origin have been obtained, and after whom I would name 
it Nematophyton Ortoni. 
1 Notes on Devonian Plants. Trans. R. Soc. Can. VII. iv. 19. 
2 Nematophycus Storriei, Ann. Bot. VI. 329. 
3 Ueber devonische Pflanzenreste aus den Lenneschiefern der Gegend von 
Grafrath am Niederrhein. Jahrbuch der konigl. preuss. geologischen Landes- 
anstalt. 1894, 67. 
[Annals of Botany, Vol. X. No. XXXVII. March, 1896.] 
