A recent investigation by Miss Holden[625] of the carbonised cuticles of some Indian specimens, sent to Cambridge by the Director of the Indian Geological Survey, and a comparison of them with preparations made from European _Cordaites_ leaves, have revealed certain distinguishing features which support Zeiller’s view that the Gondwana-Land leaves, though similar superficially to those of _Cordaites_, are probably distinct. It is, however, impossible in many cases to obtain any information with regard to epidermal characters, and though it would seem probable that had we a fuller knowledge of the Indian and southern hemisphere plants represented for the most part by leaf-impressions well-defined distinguishing features would be recognised, the comprehensive name _Cordaites_ may conveniently be retained on the ground that in the absence of well-preserved cuticles no satisfactory distinguishing features are exhibited by the impressions of _Noeggerathiopsis_. =Phylladoderma.= Zalessky. _Phylladoderma Arberi_ Zalessky. Zalessky[626] founded this genus on some Permian leaves from the Petschora basin (Adzva River) which closely resemble those of _Cordaites_ but are characterised by a coarser venation. The lanceolate lamina reaches a length of 18 cm. and a breadth of 4·2 cm.; the veins are 2 mm. apart and occasionally forked near the base of the leaf. The epidermal cells have straight walls and stomata are abundant on the lower surface. As Zalessky says, the systematic position of the leaves is uncertain though they are probably Cordaitean. The coarseness of the venation is a feature of minor importance and hardly worthy of generic recognition. _Rhiptozamites_ Schmalhausen. This genus was instituted by Schmalhausen[627] for leaves from beds in the Kusnezk basin regarded by him as Jurassic. These strata are now recognised as Permian[628] and homotaxial with those from which Schmalhausen[629] subsequently recorded the same species. The leaves, though smaller than many of the Indian and South African specimens of _Cordaites_ (_Noeggerathiopsis_) _Hislopi_, may belong to that species. Zeiller and others definitely assigned the Russian leaves to _Cordaites_. _Euryphyllum._ The Indian leaves for which Feistmantel[630] proposed this name are, as several writers have pointed out, in all probability referable to _Cordaites_. The general conclusion to be drawn from this imperfect summary of an extensive literature is that the employment of the generic names _Noeggerathiopsis_, _Rhiptozamites_, _Euryphyllum_, and others has tended to exaggerate the difference between the European and Southern botanical provinces during the Permo-Carboniferous period. _Scale-leaves, seeds, and stems._