EQUISETITES. 33 
3.—Equisetites Yokoyama, sp. nov. 
1846. ? Carpolithus sertum, Dunker, Wealdenbildung, p. 22, pl. vii. fig. 3. 
1875. Hgquisetites Burchardti (in part), Schenk, Palwontographica, vol. xxiii. 
p. 167, pl. xxvi. fig. 1. 
Type. Tubers and fragments of stems from Ecclesbourne, near 
Hastings. British Museum. Woodcuts, Figs. 2, 3 and 3*. 
Stem narrow, internodes about 1-1 cm. in length and 5 mm. 
in breadth; tubers narrowly elliptical, attached singly or in chains 
to the nodes. 
In the National Collection there are several specimens of Equi- 
setaceous tubers, both isolated and attached to stems, which are 
distinct in shape from those of £. Burchardti, Schimp. Mr. Rufford 
informs me that these two kinds of tubers never occur together, 
the specimens of the latter species being found at Bexhill, those 
of the other type at Ecclesbourne. I have decided, therefore, 
to give expression to the distinctive character of the Ecclesbourne 
tubers, and have named the new species after Dr. Yokoyama of 
Tokyo, who has in recent years made valuable additions to our 
knowledge of the Mesozoic floras of Japan. 
In E. Yokoyame there are very few details of structure shown 
in the sandstone specimens. The stems are usually in the form 
of smooth slender casts with little or no indication of longitudinal 
ribs and grooves, or leaf-sheaths; the tubers differ from those of 
£, Burchardti in their smaller size and narrower elliptical form. 
Fig 2(V. 2871). Fig. 3 (V. 2871). Fig. 3* (V. 2335), 
Tubers of Eguisetites Yokoyame, sp. nov. 
One of the best examples is represented in Fig. 2; part of a 
shrunken tuber is shown in place, and immediately below it is 
a branch attached to the node. This example, with several others, 
has probably been preserved in the sandy soil in its original 
position of growth. 
D 
