ART. S. — M. YOKOYAMA 



DESCRIPTION OF THE SPECIES. 

 I. Yen-tai, Shêng-ching-Shêng. 



1. CALAMITES sp. 



PI. IT. Figs. 6. 



Fragments of an equisetaceous plant, probably of a Calamité. 



The one represented on the right side of the figure is a stem 

 30 mm broad, with almost flat ribs which measure 1-2 mm in 

 breadth and are separated by shallow, but distinct, grooves. The 

 stem to the left of the above seems to belong to the. same plant, 

 though its breadth is not quite 20 mm. 



The form of the ribs reminds us of those of Calamités 

 SiLchowi Begnt. of the Upper Carboniferous. 



2. CALAMITES ? sp. 



PI. I. Figs. 1, 2. 



Fig. 1 represents a piece of stone with two fragments of 

 stems, one of which measures 170 mm in length and 62 mm in 

 greatest breadth. The nodes are wanting in both. 



The ribs, where they are well preserved, are convex, about 

 4 mm. broad and furnished with coarse, unequal longitudinal 

 striations, 5-(S in number. 



Fig. 2 shows a smaller specimen which presumably belongs 

 to the same plant. The ribs are indistinct, but the striations 

 are coarse and distinct. 



