FOSSIL PLANTS. 455 



STIGMARIOIDES LINEARIS, Sp. nov. 



\ 



PI. xxxi, fig. 2. 



A long, linear, cylindrical root, half an inch thick, slightly 

 tapering downwards, obtuse at the base or broken, bearing 

 narrow linear leaves or radicles one line broad, without medial 

 nerve, leaving at their point of attachment small round cica- 

 trices, placed without order and without visible central point. 

 The rootlets or the first divisions of the root are also marked 

 with round scars, fig. 2 a, indicating a subdivision similar to 

 that which is sometimes observable on leaves of Siigmaria. 



Found at Mazon creek, in concretions. 



STIGMARIOIDES AFFINIS, Sp. nov. 



PI. xxvii, fig. 9. 



THIS species, represented by two specimens, appears inter- 

 mediate between S. tuberosus and the following. It has a 

 short cylindrical base, divided like a root in branches, tending 

 obliquely downwards and diminishing to a point. This part, 

 about one inch long, is covered with horizontal, half an inch 

 long linear narrow scales, or by their scars, in the form of 

 sharply elevated points. From its slightly strangulated col- 

 lum, or top, it abruptly passes into a broad linear flat leaf or 

 blade, marked on each side by two obsolete lines resembling 

 nerves. Its surface is equally marked with distant points, 

 basilar scars of scales, a few of which are still seen on its 

 borders. These borders are straight, sharp, well defined, like 

 those of a leaf of Lepidodendron, and the surface is minutely 

 and irregularly striate lengthwise. 



Found in the concretions of Mazon creek ; by Mr. Jos. Even. 



