528 Scientific Proceedings^ Royal Dublin Society. 



PLATE XL. 

 Fig. 



1. A broken piece of stem of Bothrodendron hiltorliense. The lower half shows 



parts of several whorls of leaf-scars seen from without. The dark upper 

 part is the cortical surface of the stem, with leaf-scars seen from within. 

 It is probable that this is the type specimen of Haughton's Cyclostigma 

 Griffithii. Haughton was Professor of Geology in Trinity College, Dublin, 

 at the time he gave specific names to his Cyelostigmas ; but he does not 

 appear to have labelled his specimens. Slightly enlarged (f). (Cp. this 

 fig. 1 with his fig. 3, PI. siv, Journ. Koy. Dubl. Soc, vol. ii.) (Geological 

 Museum, Trinity College, Dublin.) 



2. A piece of stem-surface, showing well-marked leaf-scars in whorls (f). 



(Botanical Laboratory, Pioyal College of Science, Dublin.) 



3. A piece of stem-surface, showing distant leaf-scars, and one ulodendroid scar 



below (t). (Geol. Surv. Ireland Collections.) 

 4 and 5. Branching appendages of the Stigmaria stage, showing the axial 

 vascular strand (5) (Geol. Surv. Ireland Collections.) 



PLATE XLI. 



Pig. 



1. A piece of stem of Bothrodendron kiltorkense in the Enorria acicularis 



stage (i). (Cf., fig. 28, p. 63, in Potonie's " Die Silur-Flora.") Geological 

 Museum, Trinity College, Dublin. 



2. End view of the same stem, showing a crushed hollow cylinder (i). 



3. Cone or strobilus of Bothrodendron kiltorkense [Lepidostrobiis Bailyanus, 



Schimper) (i). (Geol. Surv. Ireland Collections.) 



4. Cone of same broken across, showing the whorls of sporophylls (i), and 



hollow axis. 

 6. Three isolated megasporophylls, showing the fertile spatulate base, and the 

 long sterile lamina (i). (Geol. Surv. Ireland Collections.) 



6. A group of iO-12 fertile sporophyll bases only, mostly male apparently (f). 



(Eoyal College of Science, Dublin, Collections.) 



7. A few megasporophylls (t). The megaspores (1 mm. in diameter) are 



observable. The sterile lamina does not lie in the same plane as the fertile 

 base, but is joined to it at an angle (f). (Eoyal College of Science, Dublin, 

 Collections.) 



8. The four megasporophylls show more clearly still the obliquity of the sterile 



distal to the fertile proximal part of the sporophyll (j). (Eoyal College 

 of Science, Dublin, Collections.) 



