446 
PALEONTOLOGY OF ILLINOIS. 
SiGILLARlA MASSILIENSIS, Sp. 110Y. 
PI. xxv, fig. 3 and 4. 
Stem ribbed, ribs fiat, half an inch broad, with intermediate, 
deep, sharply cut furrows; surface striated lengthwise by dis¬ 
tinct, nearly continuous lines, scarcely flexuous on the bor¬ 
ders of the cicatrices; cicatrices larger, one-third of an inch 
long, not quite as broad or half as broad as the ribs, rhomboi- 
dal, rounded at the top, enlarged downwards to the angular 
sides, obtusely pointed at the base, minutely, obscurely striate 
on the surface; vascular scars three, the lateral ones semi-lu¬ 
nar, caudate, vertical; the medial one horizontal, large, oval. 
The cicatrices are separated from each other by a space equal 
to their length. The form of the decorticated cicatrices is not 
known. 
This fine species is allied to Sigillaria intermedia , Brgt., differing in its pro¬ 
portionally larger cicatrices, and by the regular striation of the ribs, without 
cross wrinkles at the base of the cicatrices, and by their angular base. 
In the sandstone at Marseilles. 
SiGILLARlA MONOSTIGMA, Lesqx. 
PI. xxvi, fig 5. 
This species is referred, with some doubt, to the one-published in vol. ii of 
this Report, p. 449, pi. 42. It represents a part of a trunk or brauch, four 
inches broad, flattened to one-half an inch in thickness, marked all around in 
the general quincunxial order by broadly rhomboidal scars, with a round point 
in the middle, exactly of the same form as those of the cortex of Sigillaria 
monostigma , and at the same comparative distance. These scars are placed at 
the top of an inflated lanceolate cauda, three-fourths of an inch long. This 
kind of half cylindrical appendage attached to the specimen evidently under 
the cortex, gives to this species the character of a Knorria. If, as Prof. W. 
P. Shimper will have it, in his Vegctaux fussiles du terrain de Transition dcs 
Vosges , p. 33, Knorria , as a genus, differs essentially from Lcpidodendron by 
the cicatrices having a single central vascular scar, our species should be con¬ 
sidered as a true Knorria. But the same author denies the existence of any 
