CALAMARIEAE. 



(Fig. 43), and to these must be added the specimen described by Weiss l 

 from Langendreer and perhaps Hippurites longifolia 2 . Nothing can be 

 seen of the nodes ; all that appears is a regular transversal row of leaves, 

 which do not touch one another at the base but are separated by tolerably 

 wide gaps, and are very peculiar objects (Fig. 43 B}. They are composed of 

 an elliptical thickened basal portion, which is traversed by a median furrow and 

 is plainly distinguishable from the long narrowly lanceolate sharply pointed 



lamina. The lamina is often torn away and 

 the basal portion alone remains. Leaves 

 which have fallen off entire are according to 

 Weiss * Poacites zeaeformis. I have ex- 

 amined the figure in Schlotheim 4 and find 

 it comparable rather with the lobes of torn 

 sheaths of Equisetum, but it is in too rough 

 a state to allow of a certain determination. 

 There are other specimens again be- 

 sides these, in which we find the leaves 

 attached to the surface of the stem. But 

 the basal portion of the leaves is of a 

 different form, being shorter and broader, 

 and therefore a less conspicuous object. 

 In these pieces the continuous line of scars 

 which is of so common occurrence might 

 remain behind after the fall of the 

 leaves. From the list of figures we may 

 cite those of O. Feistmantel 5 and Weiss 

 (Calamitina varians, van semicircularis from 

 Bras in Bohemia) and perhaps Hippurites 



rrirrontpa in T inrllf>\r onrl T-Tiitfrn ^ Hut 



g'gantea in Bindley ana Button . out 



:*. :,, nr .<- nnifp rprtain that- tVlP Inttfr frm^il 

 ll lb 1Ot q U1Ce Certain mat 016 latter lObSll 



belongs to the present group, as no 



FIG. 43. Leaves of a Calamitina. A piece 



of the smooth surface of the stem with leaf- 



whorls attached. li a single leaf showing its 

 peculiarly formed basal portion. After Weiss 



branch-node has been preserved. In all these forms the small branch- 

 scars, which do not touch one another laterally, are peculiarly formed, being 

 somewhat flattened longitudinally on one side, whence the name of the 

 variety ' semicircularis.' 



Stur 8 explains the fact, that in Calamitinae it is the surface of the 

 stem which is so frequently observed, by saying that the solid firm outer 

 membrane was set free by maceration, and was then buried by itself. He 

 states that shreds of the outer membrane belonging to Calamites varians, 



1 Weiss (5), t. 17, f. 2. 2 Lindley and Hutton (1), vol. i, t. 190. 3 Weiss (5). 



4 von Schlotheim (1), p. 416, t. 26. 5 O. Feistmantel (3), t. 2, f. i. Weiss (5), t. 16, f. 6. 

 7 Lindley and Hutton (1), vol. ii, t. 114. * Stur (5), p. 162. 



