PRE-CARBONIFEROUS PLANTS. 



23 



14. Stiqmaria areolata, S. N.— (PI. Ill, Fig. 33.) — M.D., Gasp^. "^ 



Scars about a line in diameter^ and when traced spirally, distant from 

 each other about one and a half times their diameter. In the 

 specimen, which seems to be an impression, the scars are depressed 

 and separated from each other by raised spaces, in the centre 

 of each of which there is a slight waving furrow, giving an 

 areolated appearance. 

 The specimen ia a small fragment, but distinctly marked, and was 

 obtained from one of the bods associated with the small bed of coal near Tar 

 Point, Gasp^ Bay. Its position is thus in the lowest part of the Middle 

 Devonian. It is interesting thus to find a Stigmaria associated with a De- 

 vonian coal-bed, even though, as I have elsewhere stated, the greater part 

 of this coal appears to be composed of remains of Psilophyton. 



15. Stigmaria minutissima, S.N. — (PI. Ill, Fig. 34.)— L.D., Gasp^. 



The small but well -characterized fragment represented in the figure, seems 

 to belong to a very minute Stigmaroid root, of which only small pieces 

 have been found scattered on the surfaces of the Gaspd sandstones. 



16. Stigmaria exigua, Dn.— (PI. Ill, Fig. 30.)— J. G. S., XVIII, 308 ; 

 PI. XIII, Fig. 13.— U.D. Elmira, New York. 



*' Scars small, in depressed spaces, six in an inch vertically. Stem 

 cylindrical, an inch in diameter." 

 It may admit of question whether this is not a branch of a species of 

 Cyclostigma, rather than a Stigmaria. 



17. Stigmaria pusilla, Dn.— (PI. Ill, Fig. 31.)— J. G. S., XIX, 460 ; 

 PI. XVII, Fig. 3.— U. D. Perry, Maine. 



<* Allied to S. exigua, but with larger and more distant scars, not in de- 

 pressed areoles. 



18. DiDYMOPHYLLUM RENIFORME, Dn. — (PI. Ill, Fig. 35,)— J. G. S., 



XVIII, 309 ; PI. XIII, Fig. 15.-M.D., New York. M.D., Gasp^. , 



*' Areoles prominent, spirally arranged, reniform ; each resembling a pair 

 of small stigmaroid areoles attached to each other. Areoles 

 one twentieth of an inch in transverse diameter, and about one 

 •■'•'*^' -' fourth of an inch distant transversely and three eighths vertically, 

 in a etem three fourths of an inch in diameter." 

 This plant, as stated in a former paper, I regard as a form of Stig- 

 maria with rootlets in pairs, or double rootlets. The ori^nal specimens 



