163 
There can be little or no doubt that many of the forms referred to 
Coniopteris are true members of the Cyatheacese, but without more abundant 
evidence than is usually available, it would be rash to employ the name of a 
recent genus. 
Among existing ferns the differences between Polypodiacese and Dickson- 
iese are not always well defined, and when our knowledge of the fossils is based 
on imperfect material and without the aid of internal structure, it is advisable 
to avoid the use of a name which implies a generic identity which cannot be 
demonstrated. 
Coniopteris hymenophylloides, Brongn., var. australica. 
Figs. 6-9. 
1828. Sphenopteris hymenophylloides, Brongniart. 
Hist. veg. foss., p. 189, pi. lvi., Fig. 4. 
Pecopteris Murray ana, ibid., p. 358, PI. cxxvi., Fig. 5. 
1829. Sphenopteris stipata, Phillips, Geol. Yorks., p. 147, PI. x.. Fig. 8. 
S. muscoides, ibid., p. 153, PI. x., Fig. 10. 
1835. Sphenopteris arguta, Lindley and Hutton, Foss. Flor., PI. clxviii. 
Tympanophora simplex, ibid., PI. clxx., A. 
T. racemosa, ibid., PI. clxx., B. 
1836. Hymenophyllites Phillipsii, Goppert, Foss. Farm., p. 256. 
1838. Sphenopteris hymenophylloides, Sternberg, Flor. Yorwelt, p. 60. 
Polystichites Murray ana, ibid., p. 117. 
1850. Hymenophyllites Phillipsii, Unger, Gen. spec, plant, foss., p. 129. 
1851. Sphenopteris nephrocarpa, Bunbury, Quart. Journ. Geol. Soc., Yol. 
vii., p. 179, PI. xii., Figs, la and 15. 
1856. Hymenophyllites Phillipsii, Zigno, Flor. foss. Oolit., Yol. 1, p. 90. 
H. Murray ana, ibid., p. 92. 
1863. Cf. Sphenopteris Bunbury anus, Oldham and Morris, Pal. Ind., PI. 
xxxii., p. 54. 
Cf. Pecopteris lobata (pars), ibid., PI. xxix., p. 52. 
1873. Sphenopteris Pellati, Saporta, Pal. Franc., Yol. 1, p. 278; PI. xxxi., 
%.U 
1*876. Thyrsopteris Murrayana, Heer, Flor. foss. Arct., Yol. iv. (2), p. 30, 
PI. 1, Fig. 4 ; PI. ii., Figs. 1-4 ; PI. viii., Fig. 115. 
Thyrsopteris Maakiana, ibid., p. 31, PI. 1, Figs. 1-3, 5, 6. 
1878. Thyrsopteris Murrayana, ibid., Yol. v. (2), p. 1. PI. 1, Fig. 6. 
Dicksonites clavipes, ibid., p. 33, PI. ii., Fig. 7. 
1880. Thyrsopteris Maakiana, Nathorst, Berattelse, p. 38. 
Dicksonia nephrocarpa, ibid., p. 56. 
1892. Thyrsopteris Murrayana, Raciborski, Flor. Ivrak., p. 130, PI. x., 
Figs. 15 and 16; PI. 12, Figs. 17-21. 
Dicksonia Heerii, ibid., p. 174, PI. 10, Figs. 5-14. 
D. Zarecznyi, ibid, (pars), p. 175, PI. 12, Figs. 8, 9, 11, and 12. 
Thyrsopteris (Sphenopteris) Murrayana, Fox-Strangways, p. 136. 
Sphenopteris affinis, ibid., p. 134. 
S. dissocialis, ibid., p. 135. 
Dicksonia (Sphenopteris) hymenophylloides, ibid., p. 130. 
D. (S.) nephrocarpa, ibid. 
Sphenopteris muscoides, ibid., p. 135. 
