BY THE REV. J. E. TENISON-WOODS, F.G.S., F.L.S. 107 



in the Hawkesbury sandstone, or the similar ariel sandstone, 

 extending far to the westward, in fact over the continent. This 

 sandstone is of different ages. Some of it over-lies the Cretaceous 

 rocks, though as far as T know Thinnfeldia odontopteroides has 

 not been found in strata which are clearly above the Cretaceous. 



Thinnfeldia odontopterodes var. falcata. plate 8, fig. 1. Frond 

 graceful and somewhat of the same size as T. odontopteroides 

 simple and dichotomously divided, pinnate pinnatifid, pinnse long 

 and curved broadly lanceolate, becoming long and falcate as they 

 ascend the rachis, entire, opposite, very close but not connate, base 

 broad, and inserted by its whole length upon the rachis, becoming 

 close and short, but always lanceolate at the apex, at the base or 

 near the dichotomous division. Veins nearly the same as T. 

 odontopteroides, but the costa though forking continually is more 

 conspicuous, diverging from the rachis at a very acute angle ; 

 some nerves also forking, running direct from the rachis. Plant 

 evidently coriaceous, rachis broad and stout with a conspicuous 

 double groove, abundant at the Rosewood scrubs about ten 

 miles from Ipswich, where it is associated with the Alethopteris 

 australis, Thinnfeldia odontopteroides, Sphenopteris elongata, and 

 other common forms of the Tivoli coal flora. It is by far the 

 most abundant form, and well preserved, showing the workings 

 and venation very distinctly. 



Though Dr. Feistmantel would seem in his diagnosis of T. 

 odontopteroides to have given almost every variety of form, yet 

 the peculiarities of this species stand distinct and marked. It 

 was evidently a Fern of stouter habit than its congener, probably 

 not so large in growth. The rachis is always grooved and more 

 slender, and the terminal pinnules form a long lanceolate pair in 

 some specimens. I do not, however, exclude the possibility that 

 this may be a variety of T. odontopteroides, but if it be so it is a 

 new and distinct one which deserves to be marked. 



Odontopteris. Brongniart. 

 Fronds pinnate, generally bi-pinnate at the apex, pinnae pinnate 

 and pinnatifid, the apical ones single, sub-opposite and sub-alter- 

 nate, linear lanceolate ; pinnules obliquely inserted by the whole 



