PRE-CARBONIFEROUS PLANTS. 



25 



21. Calamodendron tenuistriatum, S. N., 

 Lepreau, New Brunswick. 



-(Pl.III,Fig.40.)— M.D., 



M 



I 



Surface of the pith-cast marked with numeroris sharp angular stria; crossed hy 

 slightly constricted articulations, distant from each other rather more 

 than the diameter of the stem. Woody envelope unknown. 



This specimen exhibits external markings somewhat similar to those of 

 C. approximatum of the coal formation, but much more slender and 

 delicate. It is obviously not a Calamite, but the cast of the pith of a 

 Calamodendron. 



The foregoing species of Calamodendra are casts of pith-cavitiea in 

 some respects allied to Sternbergia. The species of the next genus are 

 founded on plants showing their external surfaces, and of very different 

 character, as I have elsewhere endeavored to show.* 



Genus Calamites. — SucKOVJf. 



22. Calamites {Bornia) inornatus, Dn. — J. G. S., XVIII, 310 ; 



PI. XVII, Fig. 56.— M. D. , Cayuga L., New York. M. D., Kettle 

 Point, Ontario. L. D., Gasp6. 



" Ribs continuous, as in C. Transitionis, but flat and broad, the breadth 

 of each being a quarter of an inch in a stem four inches in 

 diameter. Nodes distinct, prominent in the flattened stem, 

 owing to their greater density as compared with the internodes." 



Of this remarkable species no further illustration has been obtained. If, 

 as suggested in my description, from the great amount of coaly matter 

 produced by it, it was a woody plant, it may possibly be a Calamodendron 

 rather than a Calamites ; but further and better-preserved specimens would 

 be required to prove this. Schimper (Pal. Vegetale) suggests that it 

 may be a broad-ribbed variety of the next species, but this I think scarcely 

 possible. 



23. Calamites {Bornia^ transitionis, Goeppert. — (PI. IV, Figs. 41 to 

 46). — Flora des Uebergangsgebirges. Can. Nat. vol. VI., J. G. S., 

 XVIII, 304.— M. D., St. John, and Lepreau, New Brunswick. 



The specimens obtained since my former publications on this subject, 

 confirm my belief that this plant, as found at St. John, is identical with 

 Goeppert's species. The very unequal size of the ribs and of the stems 



• J. G. 8., 1866, p. 134. Acadian Geology, 1869, p. 440. J. G. S. 1871. 



