1 8 Seward . — On the genus Myeloxylon ( Brong .). 
Finally, there is the connection between Myeloxylon and 
Medullosa referred to by Solms and Schenk. The former 
considers it an additional argument in favour of classing 
Myeloxylon with the Cycads ; the latter, in his paper on 
Medullosa and Tuhicaulis , refers to the attachment of Myelo- 
xylon to Medullosa Leuckarti , but considers the latter more 
closely related to the Ferns than to Cycads. This fact has 
as yet been simply recorded without any full description. 
I have endeavoured to state the more important arguments 
which have been made use of by the advocates of the two 
opinions as to the botanical position of the plant we have 
been considering. The conclusion to which I have been led 
by examining several specimens of Myeloxylon , and comparing 
them with numerous Cycadean and Fern petioles, is that they 
undoubtedly approach more nearly to the Cycadeae than to 
the Ferns : it has been suggested 1 that we may refer Myelo- 
xylon to a position intermediate between Ferns and Cycads. 
The few points of difference which distinguish the fossil frag- 
ments from the petioles of recent Cycads are, in my opinion, 
far outweighed by the close parallelism in more essential 
characters, and it seems reasonable to conclude that Myelo- 
xylon should be looked upon as an extinct genus, not exactly 
corresponding to any recent family of plants, but one which 
comes very near to the Cycadeae in anatomical structure, and 
probably occupies a position between Cycads and Ferns , but 
nearer to the former than to the latter. 
1 Solms-Laubach, loc. cit. (Eng. edit. p. 163). 
