On the strength of a very close resemblance between _Sphenopteris Hoeninghausi_ and _Calymmatotheca Stangeri_ (fig. 408, E, F)—characterised by fertile pinnules bearing stellate groups of small linear valves, regarded by Stur as the open lobes of an indusium—Zeiller included Brongniart’s type in the genus _Calymmatotheca_. The resemblance in general habit between the two species extends to the presence in their rachises of the _Dictyoxylon_ form of cortex[127]. The view formerly held by some authors that the valve-like appendages to the fertile segments of _Calymmatotheca_ are sporangia is incorrect: a re-examination of Stur’s specimen (fig. 408, E, F) has confirmed the original description[128]. The stellate lobes are now regarded as portions of a cupular investment of a seed similar to _Lagenostoma Lomaxi_, the female reproductive apparatus of _Lyginopteris oldhamia_. The axes of the fertile pinnae bear small thorn-like emergences probably identical with those on the cupule of _Lagenostoma_ and on the petioles of _Lyginopteris oldhamia_. It was stated in vol. +ii+ that the fronds known as _Sphenopteris Linkii_ (Goepp.) represent, with other closely allied forms, leaves belonging to _Heterangium_ stems. This statement was based on a misconception: the rachis of _Sphenopteris Linkii_, as I have satisfied myself by an examination of impressions shown to me by Dr Kidston, exhibits the reticulate pattern characteristic of _Lyginopteris_ and not the transverse ribs characteristic of _Heterangium_.