181 



or less abundance wherever Noeqgerailnopsis media is found 

 in Tasmania. Taking all these matters into consideration, I 

 am strongly inclined to regard Noeggeratliiopsis as the foliage, 

 and the winged seeds as the fruit of the coniferous trunks 

 referred to. 



Thinnfeldia (Pecopteris) Odontopteroides. Morris. 



The original descriptions by Morris are as follows : — 



Frond pinnatifidly bipinnate or flabellate ? Pinnae linear, 

 elongate, acuminate ; pinnula? opposite, approximate, adnate, 

 obtuse, entire ; veins nearly obliterated. 



Prof. Morris also adds that his specimens were embedded 

 in a coarse sandstone, and that he could trace a central de- 

 pression indicative of a midrib, from which secondary veins 

 radiated. Some of the pinnules in specimens examined by 

 him are stated to have been " more lanceolate shaped," and 

 he considered such forms to be only a " variety" of the one 

 figured. In all these references there is no indication to the 

 smaller form with forking pinnae and small obtusely rounded 

 pinnules devoid of anything approaching a midrib named by 

 me as a variety under the name T. obtusifolia. 



Through the kindness of Mr. Eobinson, of Spring Bay, I 

 have had the opportunity of examining a large and varied 

 collection of the original types of forms from sandstone at 

 Okehampton. They correspond in every respect to Morris' 

 original descriptions. 



In all the variations there is not the slightest approach to 

 a form showing forked pinna?, nor do they in any way show 

 intermediate forms approaching the form T. obtusifolia. In 

 all the pinnules there is clear evidence of a distinct and 

 rather strong midrib, and in this respect differing widely 

 from the finely nerved pinnules of T. obtusifolia, which are 

 always free after leaving margin of rachis, approaching the 

 nerves of the genus Odontopteris in this respect. 



As the latter is the prevailing form in the shales associated 

 with the coal at New Town, Compton, York Plains, Longford, 

 Mount Nicholas, etc., and as the two widely forms have 

 never been found by me together in the same beds, I am 

 inclined to consider them as distinct species. The original 

 form of Morris's T. odontopteroides is readily recognised by 

 its more robust and coriaceous appearance, and especially by 

 the deeply-furrowed midrib on the long linear ovate or 

 lanceolate-ovate pinnules. 



APPENDIX. 



" I adhere to my old divisions under a belief confirmed by 

 •subsequent survey that in many regions of the earth the geolo- 



