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MYELOPTERIS TOPEKENSIS, N. SP. 
A NEW CARBONIFEROUS PLANT. 
D. P. PENHALLOW. 
(WITH PLATES II AND III) 
DurinG the past sixty years a number of plants, variously 
described under the names of Medullosat (1832), Palmacites? 
(1845), Myeloxylon3 (1849), Stenzelia*(1864),and Myelopteriss 
(1874), have been obtained from the Carboniferous of France, 
Germany and Great Britain, but, so far as I am aware, no 
representative of this group has been obtained heretofore from 
any locality in America. 
Recently Professor C. S. Prosser has sent to me three small 
specimens of flattened stems from the upper Carboniferous of 
Topeka, Kansas. These fragments are about 6™ long and lie 
in a matrix of calcite.° One specimen represents the full 
width of the original structure and is 33™™ broad. A second 
has the edges broken off, but a natural extension of the curva- 
tures of the sides shows the probable breadth to have been about 
6™. Both of these specimens have been compressed into a 
flattened mass having a lenticular transverse section with a 
maximum thickness of 5™™ and 8™™ respectively. A third 
specimen, flattened to an irregularly lenticular mass, represents — 
thin layers of plant residue adherent to the sides of the matrix, 
Sat nirionaly: bee « sell pst of epeemnenictwe Te) 
. dimensions of breadth here given represent very ae ee ‘the 
* Cotta : Die DendrateninHeichang auf tre inmeren Bat, Dresden, 1852, 
? Corda : Beitr. zur Flora der Vorwelt. 1845. 
3 Brongniart : Tab. des gen. de vég. foss. Dict. Univ, d? Hist nat ee 
4 Goeppert : Die foss. Fil. der perm. Form. oe 
