2 MR, NEWELL ARBER ON THE CLARKE COLLECTION __[ Feb. 1902, 
affinities of fossil plants from Australia, India, South Africa, and 
elsewhere, might not be without value, especially as the more 
modern memoirs on the fossil flora of Australia, by Feistmantel * 
and ‘Tenison-Woods,’ contain in several instances only the original 
descriptions of McCoy, without amplification.” 
The exact geological age of the beds, from which these plants 
were obtained, has long been disputed. We may, however, first 
examine the plants forming the collection, reserving for the moment 
the evidence which they afford of geological age. The collection 
may be conveniently arranged in stratigraphical order, beginning 
with the Wianamatta Series, followed by the Newcastle Beds, and 
finally the plants from Arowa. 
A. Wianamatta Beds. 
Filicales. 
I. Tarnyretpra, Ettingshausen, 1852. 
Abhandl. d. k.-k. geol. Reichsanstalt, vol. i, pt. ili, no. 3, p. 2. 
THINNFELDIA ODONTOPTEROIDES (Morris). 
Woodwardian Mus. Camb., Foreign Plant Coll. Nos. 14, 16, & 17. 
Localit y.—Sandstone of Clarke’s Hill, near Cobbity. 
Thinnfeldia odontopteroides. 
1878. Feistmantel (78) p. 80 etc. & pp. 165-69, pl. xiii, fig. 5, pl. xiv, fig. 5, pl. xv, 
figs. 3-7, pl. xvi, fig. 1; also pls. ix—xi. 
1881. Feistmantel (81) vol. 101, p. 85 & pl. xxiiia, figs. 7-9. 
1883. Tenison- Woods (83) pp. 103 etc. 
1890. Feistmantel (90) pp. 101-106 & pls. xxili—xxv, pl. xxvi, figs. 1 & 2, pl. xxviii, 
fig. 8, pl. xxix, figs. 2-4. {Mr. Seward, in his ‘ Jurassic Flora of the York- 
shire Coast’ (p. 239), has pointed out that figs. 1 & 5 on pl. xxix should 
be referred to Ctenozamites. | 
1899. Potonié, ‘ Lehrb. der Pflanzenpal.’ p. 149, fig. 145. 
Pecopteris odontopteroides. 
1845. Morris (45) p. 249 & pl. vi, figs. 2-4. 
1872. Carruthers, Quart. Journ. Geol. Soc. vol. xxviii, p. 855 & pl. xxvii, figs. 2, 3. 
1875. Crépin, Bull. Acad. Roy. Belg. ser. 2, vol. xxxix, pp. 258-63 & figs. 1-5. 
1878. Etheridge, Catal. of Austral. Foss. p. 98. 
Gleichenites odontopteroides. 
1847. McCoy (47) p. 147. 
1850. Unger (50) p. 208. 
The specimen described, but not figured, by McCoy as Gleichen- 
ites odontopteroides is a sandstone-cast of a dichotomously-branched 
frond of indifferent preservation. The form of the pinnules is in- 
distinct, and the nervation totally unpreserved. In other respects 
it is very similar to that figured by Feistmantel in 1890 in pl. xxvi, 
fig. 2. Each branch is 44 inches long, and 2 inch across. The 
1 Feistmantel (90). ? Tenison-Woods (83). 
3 References to the early literature, as well as a full bibliography of the 
memoirs published on the fossil botany of Australia, will be found in 
Etheridge & Jack (81), Clarke (78) appendices, and Feistmantel (90) pp. 12. 
ét seqq. 
Olucke states, (78) p. 152, that a further collection was forwarded in 1855 ; 
but it is not known definitely whether this contained any fossil plant-remains, 
