450 PALAEONTOLOGY OF ILLINOIS. 



SlGILLARIOIDES STELLAKIS, Sp. ROV. 



PI. X*ix, 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 point. Surface obscurely wrinkled be- 

 tween the scars, with lines diverging starlike toward the near, 

 est cicatrices. 



This beautiful specimen, figured half its size, evidently represents part of a 

 root of a large Sigillaria. 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 Stigmtfria. 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. stettaris, Gopp. 



Found in the roof shale of the coal at Morris ; by Mr. Jos. Even. 



GENUS HALONIA, LI. and Hutt. 



Foss. Flor. 2, p. 12. 



THIS genus represents aborescent stems bearing two kinds of 

 cicatrices; small ones, like 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. 



