EOTISETITES. 33 



3.— Equisetites Yokoyamse, sp. nov. 



1846. P CarpoUthus sertum, Dunker, 'Wealdenljildung, p. 22, pi. vii. fig. 3. 

 1875. Equisetites Burehariti (in part), Schenk, Palseontographica, toI. xxiii. 

 p. 157, pi. 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 I'l 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 E. BureJmrdti, 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. Tokoyama of 

 Tokyo, who has in recent years made valuable additions to our 

 knowledge of the Mesozoio floras of Japan. 



In JS. YokoyamcB 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 

 E. Burchardli in their smaller size and narrower elliptical form. 



Fig 2 (V. 2871). Fig. 3 (V. 2871). Fig. 3* (V. 2335). 

 Tubers of Equisetites Tohoyamce, 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. 



