leaf-trace in the extrastelar region, but the fact that an outgoing trace was found to have two protoxylems points to a subdivision similar to that of the foliar bundles of _Calamopitys Saturni_. A well-marked difference between _Eristophyton fasciculare_ and _Calamopitys_ and _Lyginopteris_ is the more compact structure of the secondary wood; it is pycnoxylic and not manoxylic. Prof. Zalessky in criticising the use of the generic title _Calamopitys_ puts forward several arguments in support of his institution of a new designation: (i) the primary xylem strands of _Eristophyton_ are not confined to the periphery of the pith as is the case in _Calamopitys Saturni_, though he speaks of one leaf-trace in the latter species separated by several layers of cells from the xylem-cylinder; (ii) some of the pith-cells have thick walls and dark contents in distinction to the homogeneous parenchyma of _Calamopitys_, a feature of little importance; (iii) the difference in the structure of the secondary wood already alluded to, though this loses some of its significance by the occurrence of narrower rays, more like those of _Eristophyton_, in _C. annularis_; (iv) the more elliptical and broader pits in the secondary tracheids in place of the more regular hexagonal form in _Calamopitys_. While admitting a certain degree of relationship between the two types, Zalessky asserts that as yet we have insufficient evidence to justify their generic union. Scott[505] maintains that Zalessky does not attach sufficient weight to the form and mesarch structure of the primary xylem bundles as a feature common to both genera. [Illustration: Fig. 457. _Eristophyton fasciculare._ Transverse section showing the relation of primary (black) to secondary xylem. (After Scott.)] _Eristophyton Beinertianum_ (Goeppert). 1850. _Araucarites Beinertianus_ Goeppert, Mon. Foss. Conif. p. 233, Pls. 42, 43. 1872. _Araucarioxylon Beinertianum_ Kraus, in Schimper’s Trait. Pal. Vol. +ii.+ p. 381. 1888. _Araucarites Beinertianus_ Goeppert and Stenzel, Abh. K. Preuss. Akad. Wiss. p. 30, Pl. +iv.+ 1902. _Calamopitys Beinertiana_ Scott, Trans. R. Soc. Edinb. Vol. 40, p. 341, Pls. +i.+, +iv.+, +v.+ 1909[506]. _Ullmannites Beinertianus_ Tuzson, Result. Wiss. Erforsch. Balatonsees, Bd +i.+ Teil +i.+ p. 24. 1911. _Eristophyton Beinertianum_ Zalessky, Com. Geol. St Pétersb. p. 24.