KIDSTON : YORKSHIRE CARBONIFEROUS FLORA. IOI 
CALAMOCLADUS SCHIMPER. 
Calamocladus charæformis Sternb. sp. 
Ante DD. 22, 80, 
Additional locality. 
MIDDLE Coat MEASURES. 
Hor.-—Shale over Chevet Rock. Loc.—Cadeby Colliery, 
Conisborough. 
EQUISETACEE. 
EQUISETUM L. 
Equisetum hemingwayi Kidston. 
Zguisetum hemingwayi Kidston, Ann. and Mag. Nat. 
Hist., Feb, 1892, p. 138, fig. (p. 140), 
MIDDLE CoAL MEASURES. 
Hor.—Barnsley Thick Coal. Loc.— Monckton Main Col- 
liery, near Barnsley, 
REMARKS. —Although many specimens from the Coal 
Measures have been described as Equisetites, there is little 
evidence to show that they had any real relationship to the 
Æquisetaceæ. It was therefore only on the description 
of Lguisetum monyi by MM. Renault and Zeiller (Comptes 
Rendus, Paris, January 5, 1885) from the Comentry Coal 
Field, that the genus Zywisetum was determined to occur 
in carboniferous times. Their specimen consists of a 
portion of a stem. (See figure in Etudes sur le terr. houil. 
d. Comentry, Flore fossile, part IL, p. 394, pl Vil, fig. 7, 
1890). 
On several occasions I had received from Mr. Hem- 
ingway specimens of a small fossil, but which, owing to the 
imperfection of the earlier material submitted to me, I 
could not determine. Eventually, Mr. Hemingway was 
successful in discovering very perfect specimens of the 
small Equisetaceous cone, which in the early part of this 
year I described and figured as Zywisetum hemingwayi. 
This is one of the most interesting additions to the British 
