464 THE AMERICAN NATURALIST.  [Vou. XXXII. 
of cones already known as occurring in the Paleozoic rocks. As 
found in a calcified form, the cone, somewhat flattened, measures 
about 5 cm. in its greatest, and from 2 to 2.3 cm. in its shortest 
diameter. It consists of a cylindrical axis bearing numerous com- 
pressed sporophylls arranged in crowded, many membered verticils. 
Each sporophyll is divided nearly to its base into an inferior and a 
superior lobe; the lobes are palmately divided into segments, of 
which half are fertile and half are sterile, each segment consisting of 
an elongated stalk bearing a terminal lamina. ‘The large sporangia, 
of which there are usually four on each sporangiophore, are attached 
by their ends remote from the axis, to the peltate lamine of the 
sporangiophores, and contain numerous spores. These latter are 
about .o65 mm. in diameter. 
While there are certain features which suggest comparison with 
certain Gymnosperms, Dr. Scott concludes that in reality it belongs 
to the Sphenophyllezx, presenting, in certain respects, a remarkable 
agreement with such forms as Sphenophyllum dawsoni and S. Cunet- 
folium. From the additional light which this plant throws upon the 
allied genus, the Sphenophyllinee are regarded as representing a 
generalized type combining many of the features of Equisetineae and 
Lycopodinez, and indicating the common origin of these two series. 
Lepidophloios.t— Recent studies of material collected during the 
past fifty years enable the author to separate two species under the 
names of Lefidophloios acadianus and L. cliftonensis. The genus is 
represented by large and dichotomously branching trees bearing very 
long and linear leaves. The usually stout branches give rise to 
slender branchlets bearing spirally arranged and stalked cones. The 
persistent leaf bases give to the stem a rugged and scaly appearance, 
but as these characters are removed by decay or other causes, there 
often remains only a smooth surface bearing mere traces of the 
original leaves, hence much of the material properly belonging to 
this genus has been described under the name of Halonia and Both- 
rodendron. 
The internal structure conforms to the Sigillarian type. The 
author shows that the genus is clearly related to Lepidodendron, 
with which it may readily be confounded, and summarizes his views ` 
as to the general relations of this and allied genera in the statement 
1 Dawson, Sir J. W. On the Genus Lepidophloios as Illustrated by Specimens 
from the Coal Formation of Nova Scotia and New Brunswick, C. M. G., Trans 
R. Soc. Can., Second Ser., III (1897), iv, 57. 
