398 MR ROBERT KIDSTON ON THE FOSSIL PLANTS IN THE 



years ago, passing through the Trias for 101 feet into the Upper Coal Measures, but did 

 not reach any coal seams. At the end of a heading 327 feet from the surface, the 

 Permian or Trias was found resting unconformably on the Upper Coal Measures, as 

 shown in fig. 3. 



These important sections prove the thickness of the subdivision to be about 

 1200 feet, and that in any future sinking or boring through the Trias for the purpose 

 of obtaining coal, the occurrence of that amount of unproductive strata may be expected 

 before the productive Coal Measures are reached. 



SYNOPSIS OF SPECIES* 



Calamarise. 



Calamites, Suckow. 



Group I. — Calami tin a, Weiss [Emend.), 1884, Steinkohlen Calamarien, 



part ii. p. 59.t 



Calamitina (Calamites) varians, Sternb., var. inconstans, Weiss, 



PL I. figs. 1, la. 



Calamites (Calamitina) varians inconstans, Weiss, Steinkohlen-Calamarien, part ii. pp. 62 and 69, pi. xvi.a, 



figs. 7, 8; pi. xxv. fig. 2, 1884. 

 Calamites varians, Sternb., Vers., ii. p. 50, pi. xii. (cast). 

 Cyclocladia major, Feistmantel (not L. & H. (1), (in part), Vers. d. bokm. Ablager., Abth. i. pi. i. 



fig. 8. 

 Calamitina Gbpperti, Weiss, (not Ettingsnausen), Steinkohlen Calamarien, part i. pi. xvii. figs. 1, 2, 



1876. 



Description. — Internodes broader than long, faintly striate, periods of six to fourteen 

 non-branch-bearing nodes between each vcrticel of branch-scars; branch-scars oval, 

 approximate, with a more or less central circular cicatrice ; the internode at the base of 

 the period is the shortest, the next succeeding internodes have generally a slight increase 

 in their length, but sometimes their increase in length is irregular, the uppermost one is 

 generally the longest ; leaf-scars contiguous or slightly distant, transversely oval or sub- 

 triangular. 



Remarks. — The only specimen of this species in the collection is shown natural size 

 on PI. I. fig. 1, and measures about 32 cm. in length. It shows two complete and 



* In the Ravenhead collection are several ferns which are specifically distinct from any included in this list, but 

 are too fragmentary for any satisfactory determination. 



t In Abhandl. z. geol. special-harte v. PrevAsen u. Thiiringischen Staaten, Band v. part ii. 



