106 



ROYAL SOCIETY OF CANADA 



The following is the diagnosis of this species given by Lesquereux : — 



Stems large; articulations variable in distance; furroivs broad ob- 

 tuse, sometimes marked in the middle by a sharp thin line; ribs convex 

 wedge-form and alternately joined at the articulations; scars of leaves 

 distinct, obsolete or absent. 



LesquereiLX says that " the species is much like C. Suchovii and 

 separated from it by rather indefinite characters. The ribs are larger, 

 more distinctly convex, wedge-form and alternately connivent at the 

 articulations; the furrows broader, more obtusely carinate. The ribs 

 are generally broader, more flattened toward the obconical base of the 

 stems, sometimes bearing distinct, round tubercles." 



Of this species R. Kidston says : — "A very unsatisfactorily defined 

 species, and in many cases it is extremely difficult to decide whether 

 certain specimens should be referred to Calamités SucJcovii or C. can- 

 nœformis." 



The following are measurements of the examples from the Little 

 Eiver group that come nearest to C. cannœformis'. 



* " F.L."— Fern Ledges at " Bay Shore," Lancaster, St. John county, N.B. 



The width of the ribs in the second and third examples is that 

 found in C. Suckovii, and it is possible that the first only should be 

 refert'ed to C. cannœformis. 



Calamités Suckovii, Brongt., Plate I, Fig. 4. 



Brong't, Hist. Végét., p. 124, pi. XIV, fig. 6. &c. 

 Lesq'x, Coal Flora of Penn., p. 20, pi. I, figs. 3, 4. 

 D. White, Flora Low. Coal Meas. of Missouri, p. 146. 



Many stems of Calamités of the Little Eiver Group agree more 

 nearly with this species than with C. cannœformis. 



Of this species (including C. cannœformis) Sir William says, " I 

 cannot find any characters separating it from specimens found in the 

 Carboniferous. It was a true Calamités, and several of my specimens 



