The leaves so named by Lesquereux[588], from the Coal Measures of Pennsylvania, are distinguished by the elongate cuneate lamina, which reaches a length of 38 cm. with a narrow base and a slightly rounded truncate distal end, 16 cm. broad, characterised by a few broad and shallow crenulations. By contrast with some American specimens in Dr Kidston’s collection Lesquereux’s figures convey an imperfect idea of the size of the leaf. A large leaf from the Coal Measures of Belgium described by Cambier and Renier as a new species of _Psygmophyllum_, _P. Delvali_[589], is perhaps identical with the American type; the lamina of sub-triangular form has approximately the same dimensions; the veins are numerous and repeatedly forked. The leaf is much longer than any known _Psygmophyllum_ and the veins are much more numerous than in _P. majus_ Arb.[590], the largest representative of that genus. Palaeobotanists who have seen the type-specimen inform me that they have no doubt as to the Cordaitean nature of the Belgian specimens, which may be designated _Cordaites Delvali_. It is, however, not impossible that _Psygmophyllum_ and _Cordaites_ are allied genera: our knowledge of the former is limited to unimportant characters. _Cordaites_ (_Dory-Cordaites_) _palmaeformis_ (Goeppert). This Permian type, originally described by Goeppert[591] as _Noeggerathia palmaeformis_, is characterised by numerous slender veins: according to Weiss[592] there may be as many as 3–5 in 1 mm. The leaf is broadly lanceolate; it tapers gradually to an acute apex reaching a length of 80 cm. and a breadth of 10 cm. In habit the young foliage-shoots[593] resemble those of _C. principalis_ and _C. borassifolius_. Grand’Eury records the frequent association of _Samaropsis_ seeds with this species; it occurs in Upper Carboniferous and in Permian strata and is recorded from a few British localities. _Cordaites_ (_Poa-Cordaites_) _microstachys_ Goldenberg.