CALAMARIEAE. 



perfectly smooth, or is traversed by single longitudinal folds and by many 

 irregular transversal wrinkles, which can 1 evidently be only produced by 

 displacement, as Stur rightly insists, and do not represent an original feature. 

 Specimens from this group, such as are kept in the collections, show not 

 unimportant variations, which are due in part at least to specific differences, 

 in part perhaps to dissimilar mode of preservation. Ordinarily we find on 

 every node a row of small leaf-scars laterally in contact with one another, 

 which are broader in the transverse direction and have a trace-point in the 

 centre. A similar row is also observed on the nodes of the branches, but 

 they are pushed in various ways out of their regular annular position by 



the large disk-like scars 



of branches which are ,!f^^\ 

 developed close to them 

 (whether above them or 

 beneath them cannot be 

 determined), as is ex- 

 cellently described by 

 Weiss 2 (Fig. 42). Good 

 figures of specimens of 

 this kind are to be found 

 in Weiss 3 , Ettingshau- 

 sen 4 and O. Feistman- 

 tel 5 . In one of the last- 

 mentioned specimens 

 which have been de- 

 scribed by Weiss, the 

 leaves are still attached 

 on both sides in the form 



r , . , i . r FIG. 42. Surface of stem of Calamitina. A and B with alternating 



Ol tnin Curved lines OI . nodes of leaves and branches. C small piece with row of leaf-scars. After 

 , f Weiss (5). A slightly, B more highly magnified. 



coal. Specimens of the 



state of preservation here described were formerly known by Lindley and 

 Hutton 6 and others as Cyclocladia ; but the name was afterwards applied 

 to quite different objects (Halonia). A well-figured Calamitina of this 

 kind, which was placed with Ulodendron, appears in Steinhauer 17 under 

 the name of Phytolithus parmatus. 



On the other hand there are specimens with perfectly smooth surface, 

 and with the leaves still attached, so that the scars of course are concealed. 

 To these belong the famous Wettin fossils, which have been figured again 

 and again, first by Germar 8 , then by Schenk 9 , and lastly by Weiss 10 



1 Stur (5), p. 162. * Weiss (5), t. i6a, ff. 7, 8, and t. 17, f. i. * Weiss (6), 1. 17. 



4 von Ettingshausen (5), t. I, f. 4. 8 O. Feistmantel (3), t. i, f. 8. 6 Lindley and Hutton (1), 



vol. ii, t. 130. 7 Steinhauer (1), t. 6, f. i. 8 Germar (1), t. 20, f. i. Schenk (2), t. 34, 

 f. i andt. 35, f. i. 10 Weiss (5), t. i. 



