NEW FORMS OF CALAMITES 1 49 



whorl, opposite in position, to which 8-12 ribs converge. Numerous 

 leaves. 



The type specimen, a east of the medullary cavity consists of 

 one almost perfect node, and well preserved portions of two others. 

 While also subjected to a flattening process, it has not split. The 

 one measurable node has a diameter of 16 1-2 cm. A break in the 

 wall of the cast shows the imprint of the cavity wall on the core- 

 like matrix. 



It became clear that of all previous species described, the 

 specimen resembled most closely the Calamites ramosus of Artis. 

 Of the three figures of this species given by Jongmans, those from 

 Artis and Stamm bear hardly a superficial resemblance, while 

 that of Weiss, although approximating, gives indications of some- 

 what different characters. 



The internodes of the older part of the stem are not slender, 

 and are hardly longer than wide. The ribs so far as this particular 

 specimen is concerned, are devoid of tubercles, they are not bluntly 

 pointed as in ramosus, and average 1 1-3 mm. in width, the furrows 

 1-3 mm. They apparently never alternate, and continue from node 

 to node, a character not to be observed in the figure of Weiss. 

 Xo trace of any microscopical striation is to be found here, and the 

 average number of ribs to the cm. is only about 1-3 as great. There 

 is no well defined "corona" surrounding the insertion point of the 

 branch scar, and these are much smaller. It will be observed that 

 the stem (?) begins in a fashion never found in ramosus according 

 to Weiss and Zeiller, and resembling that found in Suckowi. 

 Still another distinguishing point is the comparatively small number 

 of ribs taking part in the formation of each branch scar. 



Calamites Fettermanni n. sp. 

 PI. III., figs. 1. 2. 



Stem only moderately slender, articulations well set off by nodal 

 swellings. Joints at least 3 limes as long as wide. Ribs pointed, 2 

 mm. in breadth, not alternating, distinct, fiat or rounded, longitudinally 

 striated, when iiattened giving the furrows a doubly striated appearance. 

 Furrows 1-3 to 1-2 mm. in breadth. Tubercles present but mostly 

 indistinct. Branch scars alternating probably 6 to the whorl, insertion 

 points 2-3 mm. in width. Leaves apparently absent. 



I Jongmans W. J., " - nleitung zur Bestimmung der Karbon pflanzen 

 West Europas. " Bd. I (1913), from whose descriptions also, the greater 

 part of the comparisons have been made. 



