102 GANGAMOPTERIS. 



V. 2909. Several root-like structures with, median grooves, 

 associated with fragments of rootlets. 



Farm Glencalder (at 6,700 feet s.m.), Newcastle Division, Natal. 



Pres. by D. Draper, Esq., 1893. 



V. 2906. Fragments of a rhizome-like structure, and of rootlets. 

 Farm Glencalder (at 6,700 feet s.m.), Newcastle Division, Natal. 



Pres. by B. Draper, Esq., 1893. 



V. 2905, V. 2905«, V. 2905^. Numerous fragments of rootlets, 

 in association with Glossopteris. 



Farm Glencalder (at 6,700 feet s.m.), Newcastle Division, Natal. 



Pres. by D. Draper, Esq., 1893. 



V. 8318. A piece of sandy shale, largely composed of root-like 

 structures, hearing lateral rootlets. The details of the external 

 morphology are not very clear. 



Candiota, Rio Grande do Sul, Brazil. 



Pres. by J. Mawson, Esq., 1894. 



V. 8316, V. 8316ff, V. 8317. Smaller fragments, similar to the 

 last sjiecimen, consisting chiefly of lateral rootlets. 

 Candiota, Bio Grande do Sul, Brazil. 



Pres. by J. Mawson, Esq., 1894. 



Genus GANGAMOPTEEIS, McCoy, 1861. 

 [Trans. Eoy. Soc. Yictoria, vol. v (1860), p. 107, note.] 



Frond simple, entire, greatly varied in shape, elliptical, broadly and 

 elongately ohovate, broadly lanceolate, sub-linear, etc., contracted 

 towards the base. Midrib absent. Median nerves more or less 

 parallel, anastomosing ; lateral nerves arising by repeated dichotomy 

 from the median nerves or from the base, arched, bifurcating, and 

 anastomosing to form a network. 



The chief feature in which Ganyamopteris differs from Glossopteris 

 is the absence of a definite midrib, the median portion of the leaf 

 being usually traversed by a group of almost parallel, anastomosing 

 nerves. The anastomosing lateral nervation is very similar in both 

 genera, and almost as great variations are found in Ganyamopteris 

 as in Glossopteris, in the habit and details of the nervation, even 



