114 ROYAL SOCIETY OF CANADA 



and the nodes sometimes obscurely marked in the flattened stems, and 

 difficult to distinguish because the ribs run continuously from node to 

 node. 



Sculpture. — Typical examples of this species have about 6 or 7 

 ribs in the space of one centimetre; but there are examples with wider 

 ribs, and others narrower; in these, however, the ribs may be alternate, 

 the wider examples may be poorly preserved stems of C. Suchovii, and 

 the narrower of C. Cistii. 



The outer surface of the skin may be smooth in uncompressed speci- 

 mens, but all that we have are flattened and carry minute longitudinal 

 striations; this is more clearly seen on the interior of the bark where 

 the vascular bundles of the skeleton of support are impressed; there 

 are about fifteen or twenty of these minute striœ on each rib, and the 

 •number of the striae and the elevation above the surface is irregular. 



The leaves of these plants from the Little Elver terrane resemble 

 those of Asterophylliles longissitnus described further on. These long, 

 straight and rigid leaves are quite different' from the bifurcating, flex- 

 uous leaves described by Stur and Schimper as characteristic of the 

 European species Arch œo calamités radiatus {-= Asterocalamites scor- 

 hiculatus) hence it has been thought better to distinguish these old 

 stems as A. scorhicuJoides. Since Lesquereux has found that similar 

 straight leaves belong to the form from Pennsylvania which he has 

 referred to Bornia radiata it seems possible that this may be the species 

 A. scorhicul aides, but of a later age. The fossil from Little Eiver 

 beds which resembles the branch which Lesquereux has referred doubt- 

 fully to Bornia radiata ^ has a much slenderer stem than Asteropliyllites 

 'longissimus, which, as I have mentioned above, appears to be the leafing 

 portion of a species like A. scorhiculoides. As I have not found this 

 object in actual connection with A. scorliculoides, however, I do not 

 feel justified in uniting it with that species. 



The irregular ribbing of Asterocalamites and the straight-across 

 furrow, as well as a tendency to be contracted at the nodes, would seem 

 to show a relationship to Calamodenrlron. 



EAMTCALAMUS n. gen. 



This form is one of those comprehensive types like Arthrostigma ^ 

 found in the early Palfeozoic floras that combine the characters of several 

 of the later genera. 



1 Coal Flora, Penn., Vol. III., pi. XCIII., fig. 2. 

 '''Fossil plants of the Devonian and U. Silurian of Canada, p. 41. 



