436 PALAEONTOLOGY OF ILLINOIS. 
slightly inflated bolster, and topped by a small rhomboidal leaf scar, marked 
with three vascular points. The details characterizing this species, and which 
have not been given by the authors, are represented in our plate 22 , fig. 4. 
The outline of the cicatrices diflfers indeed from that of the known species of 
Lepidodendron , and when the surface is somewhat erased, as in the part repre¬ 
sented fig. 46, and as is generally the case on specimens of this species, it is un- 
distinguishable from that of Sigillaria Menardi, Brgt. 
In its decorticated state the species equally preserves the appearance of a 
Sigillaria , its wrinkled surface beimr marked by mere semilunar, inflated dots, 
as seen in fig. 4. The strobile scars are proportionally large, approximated to 
each other, alternating in two vertical rows, nearly exactly round, or rather en¬ 
larged horizontally. 
Mr. Jos. Even, of Morris, has kindly sent photographic plates of large spe¬ 
cimens of his, which bear these strobile scars, one and a-half inches in diam¬ 
eter, at a horizontal distance of three inches, and only one and a-half inches 
from each other in vertical direction: The vertical distance of these scars is 
apparently variable 3 it is, however, generally shorter in this species than in 
the following ones. 
On stiales at Morris and Colchester. 
Ulodendkon ellipticum, Sternb. 
PI. xxii, fig. 3, and PI. xxiii, fig. 1 to 3. 
Under the name of Lepidodendron ornatissimum, Prof. Brongniart has repre¬ 
sented in his Foss. Flor., vol. 2, pi. 18, a large specimen of this species. As 
there is not as yet a detailed description of it, and as the cicatrices of the sur¬ 
face are not as clearly defined on the European specimens as on ours, I have 
figured the essential parts of this species as exemplifications of its general ap¬ 
pearance. 
The surface cicatrices are almost exactly rhomboidal, angular on the sides, 
slightly elongated, more or less distant, with the leaf scar nearly central, 
marked in the middle by a depression or small hollow, as indicating the place 
of a single vascular scar. These scars arc not indicated by any of the Euro¬ 
pean authors. It is probable that the two lateral ones are.*ohliterated, but, 
although a great number of specimens were carefully examined, they could not 
be detected on any one of them. PI. 23, fig. 3 enlarged, shows the details of 
the forms of these cicatrices. 
The strobile scars on this species are opposite to each other, vertically more 
distant than in the former, or four to six inches, and horizontally six inches. 
