104 THE ROYAL SOCIETY OF CANADA 



have been mascerated by floating for a long time in water. In the 

 quarry at Kiltorcan the Cyclostigma is found in layers different from 

 those in which Cydopteris hibernica occurs. The obliquity of the 

 line of scars is due to the distortion caused by lateral pressure of the 

 mudstone in which the fossils occur. The whorled arrangement of the 

 leaves, (each whorl of leaves being alternate to that above and below 

 it), is well shown in these figures. Plate II, Figure 1 shows a flattened 

 stem 3| inches in diameter; leaves in alternate whorls, twenty-five in 

 each whorl; whorls one inch apart. . Central woody axis six 



tenths (6/10) of an inch in diameter (flattened) shown by a strongly 

 marked band in the center of the stem. This is the largest of the 

 specimens of Cyclostigma found at Kiltorcan. ^ and I have given the 

 specific name from this locality. 



"Cyclostigma minuta Plate II, Fig. 3. 

 (Said by Prof. Johnson to be conspecific with the preceding.) 

 "Leaves in alternate whorls, the whorls being somewhat more 

 distant from each other than the leaves; the center of each leaf-scar 

 is marked by a well defined minute dot. Branches of stems dichoto- 

 mous. This is the species figured by Sir Charles Lyell in his book 

 ("Manuel") 5th ed. p. 418. It is represented in my figure in its 

 natural condition, and is a well-marked and easily recognized fossil. 

 It is also the fossil figured in the Journal of the Geological Society of 

 Dublin, Vol. VI, p. 235, and named Lepidodendron minutum. The 

 latter was found at Yellow Bridge, Co. Waterford^. 



"Cyclostigma Griffithii." 

 (Said by Prof. Johnson to be conspecific with C. Kiltorkense) . 



"Leaves in alternate whorls, forty in each, whorls less than half 

 an inch apart . . . Stems two and a fifth inches (2i in.) in 

 diameter (flattened). The leaves of the whorl are rendered oblique 

 to the transverse axis by distortion; and where oblique there are six 

 leaf intervals to the inch; but where they run across the stem (not 

 shown in the figure) in their natural position they are nine to the 

 inch. 



I have written Professor Haugh ton's description of this form and 

 with Professor Johnson cannot see that it is sufficiently distinct from 

 C. kiltorkense to be regarded as a separate species. 



Here for a time rested our knowledge of C. Kiltorkense, but about 

 A.D. 1911 Professor Johnson resumed the study of this species and 



^T. Johnson has found examples twice as wide as this. 



^The small branches of C. Kiltorkense have the bolsters much farther apart 

 than they are shown in this species. 



