YORKSHIRE NATURA LISTS’ UNION. 
REMARKS.-—Zeiller (Flore foss. d. bassin houil d. 
Valen., p. 339) has suggested, on account of the 
apparent periodic occurrence of the branch scars on 
Calamites undulatus, that it might perhaps belong to 
Weiss’ Calamitina, but not having sufficiently perfect 
specimens to determine the number of intervening branch- 
less nodes, he retained the species in Calamites. Speci- 
mens received from Mr. Hemingway confirm M. Zeiller's 
opinion. These examples show that the number of 
branchless nodes which intervene between those bearing 
branches, is very irregular. One specimen where two 
nodes bearing branches are preserved shews that between 
the branch-bearing nodes, only two branchless nodes occur. 
On another specimen, after a branch-bearing node, eight 
nodes occur without any trace of branches, and in a third 
case nine branchless nodes are shown without the occur- 
rence of a second branch-bearing node. Sometimes the 
internodes succeeding a branch-bearing node are much 
shortened, in other cases their length is about equal to the 
other intervening branchless internodes. 
Another point which shews Calamitina to be the true 
place for Calamites undulatus is its possessing a smooth 
outer surface as evidenced by a portion ofthe bark possess- 
ing Calamitina characters still attached to one of the casts 
of Calamites undulatus. 
Group III. —STYLOCALAMITES Weiss. 
Stylocalamites suckowii Brongt. sp. 
Ante, pp. 19, 67, 85. 
Additional localities. 
MIDDLE CoAL MEASURES, 
Hor.— Woolley Edge Rock. Loc.—Smithies, near 
Barnsley. 
Hor.— Shale over Chevet Rock. Loc.—Cadeby Colliery, 
Conisborough. 
Geol. Trans. Y.N.U., 1893. 
