no 



ROYAL SOCIETY OF CANADA 



The following is a tabulated showing of the dimensions of this 

 species : — 



Calamités Cistti, Brong. mut. Plate III, Figs. 1 and 2. 



Brongt, Hist. d. Yégét. Foss. p. 129, pi. XX. 



Lesq'x, Coal Flora of Penn. p. 27, pi. I, fig. 6. 



D. White, Flora Low. Coal Meas. Missouri, p. 149. 



The following are the character of the species Calamités Cistii, 

 Brongt. as given by Leo Lesquereux : — 



Articulations about equally distant, except toward the base; ribs 

 narroiv, half round, vnth obtuse striate furrows; tubercles generally 

 absent or small, round, indistinct. 



He adds, " the species is easily recognized by its regular narrow 

 ribs, either convex or half round, the length of the internodes greater 

 than in C. Suchovii, and the general absence of leaf tubercles. The 

 stems are generally of small size, at least never as large as the distance 

 between the articulations." 



Among the common species of Calamités in the Little Eiver strata 

 is one which Sir William Dawson has not separated from Aster ocalamites 

 scorbiculoides (Calamités transitionis of Sir William's essays) , but which 

 on account of the alternate ribs and their narrowness is evidently dis- 

 tinct from that species. It has the following characters : — 



Stems with long joints and close narrow ribs, and generally obscure 

 leaf scars. The internodes are usually twice as long as the width of 

 the stem. The stein is smooth when not marhed by the impression of 

 the vascular bwidles within; elsewhere it rises in rounded ribs resem- 

 bling those of Asterocalamites scorbicidoides in form and striation, but 

 the ribs are much narrower than in that species and are marhed by 

 about two irregular longitudinal siriations. 



