214 Scientific Proceedings, Royal Dublin Society. 



EXPLANATION OF PLATES. 

 (The Illustrations of Plates XV-XVI are from photographs by Mr. T. Price.) 



PLATE XIV. 



Root-stock of Bothrodendron MUorkense. The letters a, a indicate the ground- 

 level. Above.this is the aerial stem, showing the distant leaf-scars. Below 

 it, with traces of leaf-scars, the forking Stigmaria with appendages and 

 scars. (From a water-colour drawing by Miss Barnes.) (i.) 



PLATE XV. 



Fig. 



1. Root-stock of B. kiltorkense. (Of. PI. XIV.) (1.) 



2. Illustration of the region around a, a in PI. XIV to show the leaf-scars in 



oblique rows, and the wrinkled Stigmaria surface below. (Of. PI. XIV.) (f .) 



PLATE XVI. 

 Fig. 



1. A forking-shoot showing a sterile limb. The right limb is hidden in the rock, 



but ends in a cone to be seen on the other side of the slab. 



2. Forked shoot bearing two cones. Note traces of distal ends of sporophylls. 



The counterpart of fig. 1 is on the underside of the slab, and gives fig. 2. 

 Thus it is possible to reconstruct the actual terminal shoots of JS. kiltorkense. 

 Dichotomy is a pronounced feature. Sometimes the limbs of the 

 terminal fork are sterile. (See my previous paper " On Bothrodendron 

 (Cyclostigma) kiltorkense, Haughton, sp."in Scient. Proc. Roy. Dubl. Soc, 

 vol. xiii, No. xxxiv, March, 1913.) 



PLATE XVII. 



Fig. 



1 & 2 (i) Drawings of the sterile limb of the forking shoot photographed in 

 PI. XVI, fig. 1. They are the counterparts of one another. The crowded, 

 confused arrangement of leaf-scars shows that the stem was flattened, 

 causing the leaf-scars on both surfaces to appear in the impression. 



PLATE XVIII. 



Restoration of Bothrodendron kiltorkense, after Kidston's one of B. pimctatum, 

 L. & H. 



