Notes on Evian (Devonian) Plants. 431 
Dogan‘), all of which confirm his previous results. More 
special attention is given to WV. Hicksii and to three other 
plants previously described under the name of Nematoxyten 
crassum, Dn., Nemotoxyten tenne, Dn., and Cellutoxyten prime- 
vum, Dn., but all of which are here referred to the genus 
Nematophyton, thus making the whole number of probable 
species belonging to this genus of ancient Alge, five. 
The facts stated with reference to NV. Hicksii add nothing 
to what had been observed by others. The material is 
wholly in fragments and the structure is represented only 
by siliceous coats of the cells, 
Nematoxyten crassum is shown to present the same general 
structural features—museptate, tubular cells branching into 
a secondary system of intercellular filaments, as the species 
of Nematophyton previously described. NMematophyton tenne 
shows cells of a tubular character, but of very alternated 
Size, without any well marked intercellular filaments, and 
in its general structure approaching more nearly to the 
hyphal structure of Nematophyton laxum. 
Cellutoxyten primevum is shown to be a highly altered 
form of Nematophyton, the alteration having been effected 
through crystallization of silica and consequent redistribu- 
tion of the highly decayed organic matter; the result 
being the formation of an ill-defined cellular structure. 
Comparison is made with well authenticated specimens of 
NV. Logani, in which the same section, embracing variously 
altered structure, shows in one part normal cells, and in 
another part a false cellular tissue precisely similar to that 
of N. primevum. This latter is therefore referred, on 
geographical grounds as well as of probable structure, to WV. 
crassum, 
The Paper is illustrated by several photo-micrographs, 
showing the structure of the various species described. 
The author also drew attention to further examinations 
of the laminated fossil described in his communication of 
last year, and also to w certain resin-like material occurring 
abundantly in the Gaspé Sandstones and always associated 
with Nematophyton, That the laminated fossil represents 
26 
