100 



INDEX 



Pterygotus, 4 



Ptilophyton, 9, 17, 31 (Fig. 12), 32 



(Fig. 13), 33 (Fig. 14), 35, 37, 



50, 78, 81 



Ptilophyton hostimense. 33 (Fig. 14) 

 P. Thomsoni, 10, 31 (Fig. 12), 32 



(Fig. 13) 



Reid, J., 29 



Rhacophyllum, 84 



Rhacopteris, 9, 11, 61 (Fig. 33), 69, 



79 (Fig. 42), 81, 84 

 Rhacopteris furcillata, 61 (Fig. 33) 

 R. paniculifera, 79 (Fig. 42) 

 Rhizocarps (Hydropterideae), 39, 46 

 Rhynia, 3, 15, 16, 20, 24, 25 (Fig. 



7), 26, 44, 46 

 Rhynia Gwynne-Vaughani, 1,2, 22- 



25 (Fig. 7), 26 

 Rhynie, Aberdeenshire, 5 

 Roragen, 6, 7, 12, 43, 44 

 Russia, 4, 6, 7, 12, 67, 68, 91 



Schimper, W. P., 11 



Scotland, 3, 5, 7, 10, 11, 14, 16, 26, 



29, 38, 42, 91 

 Scott, D. H., 72 



Sedgwick Museum, Cambridge, 76 

 Selaginella, 86 

 Sigillaria, 48, 69, 86 

 Silurian, 5, 8, 16, 38, 75, 89 

 Spermophyta, 71 



Sphenophyllales, 71, 77, 86, 87, 88 

 Sphenophyllum, 9, 12, 52 (Fig. 24), 



54, 76, 77 



Sphenophyllum Dawsoni, 77 

 S. subtenerrimum, 52 (Fig. 24) 

 Sphenopsida, 9, 10, 52-56, 65, 71, 



72, 74-77, 86, 87 

 Sphenopteridium, 9, 10, 12, 13, 61 



(Fig. 34), 62 (Fig. 35), 81 (Fig. 



44), 83 



Sphenopteridium condrusorum, 11 

 S. moravicum, 81 (Fig. 44) 

 S. rigidum, 11, 61 (Fig. 34), 62 

 Sphenopterids, 84 

 Sphenopteris, 9, 11. 12, 13, 64, 79, 



81, 82 (Figs. 45 and 46) 

 Sphenopteris affinis, 81, 82 (Fig. 45) 



S. bifida, 81, 82 (Fig. 46) 



S. densepinnata, 11 



S. Hookeri, 11 



"Spines" on axis of Psilophylon, 



18-26 



Spiropteris, 12, 35 

 Spitzbergen, 6,' 7, 12, 56, 67 

 Sporochnus, 50 

 Sporogonites, 12, 44, 45, 71 

 Stele, comparison of that of Psilo- 



tales with that of Psilophylon, 



88; origin of in the earlier 



Cormophyta, 89-91 

 Sternberg, C. von, 68 

 Stigmaria, 12, 64, 90 

 Stringocephalus Burtini, 5 

 Stur, D., 37, 51 

 Sykes (Thoday), M. G., 86 



Taeniocrada, 9, 42, 47 

 Telangium, 11 

 Thoday (Sykes), M. G., 86 

 Thursophyton, 9, 10, 12, 28 (Fig. 



10), 29, 30 (Fig. 11), 31, 50, 



51, 85, 86 

 Thursophyton Milleri, 10, 28 (Fig. 



10), 29, 30 (Fig. 11), 31 

 T. Reidi, 10, 29, 30 

 Tmesipteris, 49, 87, 88 

 Triphyllopteris. 11 



Unger, F., 69 



United States, 2, 6, 7, 13, 16, 37, 



38, 42, 56, 67, 91 

 Unknown genera in Devonian rocks, 



69 



Victoria, 6, 13 



Wales, 4 



White, D., 2, 37, 42, 47, 66, 67, 



68 

 Wood, Petrified, 13, 91 



Xenotheca, 11, 67 



Zosterophyllum, 50, 85 

 Zosterophyllum myretonianum, 11, 

 41 (Fig. 22), 42 



CAMBRIDGE: PRINTED BY J. B. PEACE, M.A., AT THE UNIVERSITY PRESS 



