a AG 
also occurs on the leaf of another gymnosperm, the cycad, Podo- 
zamites distans. 
Locality : Norheast of Minas, Santa Catharina. 55 meters above 
the granite, or 225 meters palo the Iraly black shale. Lot 3921. 
PTERIDOPHYTA 
EQUISETALES 
Equisetites 
Sternberg, Versuch Fl. vol. 2°, 1833, p. 43 
Lquisetites calamitinoides n. sp. 
pl. v, figs. 7, 7a. 
Sheath very short, appressed, teeth erect, nearly contiquous, in 
length nearly equalling the width of the stem, slender, linear, the 
borders nearly parallel, tapering very gradually near the apex, nar- 
rowly acute; midrtb very thick, nearly equalling the breadth of the 
tooth at the base, where it is convex at the lateral borders, flatly convex 
dorsally and minutely striated longitudinaly, taperin g rather rapidly 
just above the point of fission to about one half ‘its basal width, and 
passing upward, flatly convex, with slight diminution in width, ‘to the 
abruptly narrowed apex; lamina narrow, sublending the narrow sulci 
between the midrib at the base of the leaf, on either side nearly equal to 
the midrib in width half way up, and, in the distal third; narrowing 
gradually to the slender apex. 
The spicies defined above is based entirely on the characters of 
sheath and leaves little being known of the features of the stem. 
In the fragment shown in Plate V, Figure 7; the axis seems to be 
represented by the cortex only which is split and obliquely overlapped. 
Slight traces of ribs are topographically indicated in the specimen, 
which shows indistinct evidence of another node 13 mm _ below that 
bearing the preserved sheath. T he aspect of the detached cortex 
suggests that of Calamitina Weiss. The sheath is relatively short, 
being little over 2.5 mm in height. The form of one of the leaves 
fortunately showing the apex, on theright of the specimen, is shown 
in Fig. 7a. 
