450 
PALAEONTOLOGY OF ILLINOIS. 
SlGILLARIOIDES STELLAEIS, Sp. UOV. 
PI. xxix, fig. 3. 
Stem cylindrical, half a foot in diameter, irregularly inflated 
and contracted, obliquely crossing the shale, marked on its 
surface by small, round, slightly angular, sometimes nearly 
square or triangular cicatrices, in exact quincunxial order. 
These are slightly upraised above the surface, truncate, with¬ 
out trace of vascular poiiit. Surface obscurely wrinkled be¬ 
tween the scars, with li-nfes*diverging starlike toward the near¬ 
est cicatrices. 
This beautiful specimen, figured half its size, evidently represents part of a 
root of a large Sigittaria. Its oblique position in the shale is marked by the 
upper and lower flattened surface, to which the direction of the stem is at an 
angle of thirty degrees. The inflation and contraction of the cylinder, which 
is irregularly strangulated, indicates also a tree’s root. The scars placed in 
regular order, though double the size marked in the figure, are much smaller 
than cicatrices of Stlgmclria. In the strangulated part of the cylinder, some 
of these cicatrices are deeply immersed in the stone, and do not show, any more 
than those which are slightly upraised above the surface, any trace of a mam¬ 
milla or central point. The wrinkles-of the surface and their direction resem¬ 
ble those of Stigmaria anabathra var. stellaris, Gopp. 
Found in the roof shale of the coal at Morris; by Mr. Jos. Even. 
Genus HALONIA, LI. and Hutt. 
\ 
Foss. Flop. 2, p. 12. 
This genus represents aborescent stems bearing two kinds of 
cicatrices; small ones,dike round or rhomboidal points closely 
approached, disposed in regular spiral order around the stem ; 
large ones more distant, upraised like half round, obtuse tuber¬ 
cles, disposed about in quincunxial order. 
