KIDSTON: YORKSHIRE CARBONIFEROUS FLORA. 17 



Middle Coal Measures. 



Hor. — Barnsley Thick Coal. Locs. — East Gawber Colliery, 

 near Bariisley (Hemingway). Woolley Colliery, Darton, 

 near Barnsley (Hemingway). 

 Lower Coal Measures. 

 Hor. — Elland Flagstones. Loc. — Northowram,near Halifax. 

 (Halifax L. and P. Society.) 



Remarks. — This species (under the name of van 

 mconstans, which does not difler from Calamites gopperti 

 Ett.) has been treated by Weiss as a variety of Calamites 

 varians, Sternb. Zeiller on the other hand regards it as a 

 distinct species, and this opinion is adopted here. 

 Although Calamites are such common fossils, the group to 

 which this species belongs, viz. :— those with periodic whorls 

 of large disc-like scars, is by no means well-known, so all 

 such specimens should be most carefully preserved. 

 Calamitina verticillata L. and H. sp. 



Cala?nites verticillattis L. and H., Fossil Flora, vol. ii, p. 159, 



pi. cxxxix. 

 Middle Coal Measures. 



Hor. — Houghton Common Rock. Loc. — In the Sandstone 

 Rock of Hound Hill, near Pontefract. 



Remarks. — I have not met with any specmiens that 

 could be referred to this species. The authors of the 

 Fossil Flora say, ' It is different from any species that has 

 yet been met with on account of its distinct whorls of 

 large deep scars. . . .' Unfortunately this character 

 is not alone sufficient to distinguish this species from others 

 now known, and I must confess that I have a difficulty in 

 understanding what are the characters by which C. 

 verticillata L. and H. sp. is to be distinguished from certain 

 other forms. Additional specimens of this plant are there- 

 fore very desirable, and if possible from the original locality. 

 Group II. — EUCALAMITES Weiss. 

 Eucalamites ramosus Anis sp. 



Calamites ramosus Artis, Antedil. Phyl. pi. ii. 



B 



