_Clathropteris_, founded by Brongniart[958] for Rhaetic specimens from Scania, agrees very closely with some species of _Dictyophyllum_, but in view of the more rectangular form of the venation-meshes it is convenient to retain both names. The type-species was originally named _Filicites meniscoides_[959] and afterwards transferred to _Clathropteris_. An examination of Brongniart’s specimens has convinced Nathorst of the specific identity of _C. meniscoides_ and _C. platyphylla_. The Tonkin leaves described by Zeiller[960] under the latter name should, therefore, be included in _C. meniscoides_, which may be thus defined: The petiolate frond is characterised by an equal dichotomy of the rachis, as in _Dictyophyllum_; each branch bore 5–15 pinnae, disposed _en éventail_, reaching a length of 20–30 cm. and fused basally as in _D. Nathorsti_ Zeill. Pinnae linear lanceolate, slightly contracted at the lower end and gradually tapered distally. The lamina, 3–14 cm. broad, is characterised by obtusely pointed marginal lobes. From the midrib of each pinna lateral veins are given off at a wide angle, and adjacent veins are connected by a series of branches which divide the lamina into a regular reticulum of rectangular and polygonal meshes (fig. 285). The sori are abundant and contain 5–12 sporangia like those of _Dictyophyllum_. [Illustration: FIG. 285. _Clathropteris meniscoides._ From Rhaetic rocks near Erlangen. [M.S.]] [Illustration: FIG. 286. _Clathropteris egyptiaca._ (Nat. size.) _a_, _b_, pieces of main ribs in grooves.] What is probably the rhizome of this species has been described by Nathorst (_Rhizomopteris cruciata_); it is similar to that of _Dictyophyllum_, but the leaf-scars are more widely separated. This species occurs in Upper Triassic, Rhaetic or Lower Jurassic rocks of Scania, France, Germany, Switzerland, Bornholm, North America, China, Tonkin, and Persia and is represented by fragments in the Rhaetic beds of Bristol[961]. _Clathropteris egyptiaca_ Sew.[962] Fig. 286. The specimen on which this species was founded was discovered in the Nubian Sandstone east of Edfu; the age of the beds is uncertain, but the presence of _Clathropteris_ suggests a Lower Jurassic or Rhaetic horizon[963]. Seven strong ribs radiate through the lamina from the summit of the petiole; at _a_ and _b_ small pieces of the projecting ribs are shown in the grooves. From the main veins slender branches are given off at right angles and, as seen in the enlarged drawing, these again subdivide into a delicate reticulum with free-ending veinlets. [Illustration: FIG. 287. _Camptopteris spiralis._ (After Nathorst. Much reduced.)] _Camptopteris._ _Camptopteris spiralis_, Nath. Figs. 282, C; 287.