plant possibly lived in very humid situations or grew submerged. Miss Sollas’s investigations afford a satisfactory demonstration of the lycopodiaceous nature of this small Rhaetic species: as I have elsewhere suggested[210], the generic name _Lycopodites_ should be substituted for that of _Naiadita_. Examples of this species may be seen in the British Museum. The Rhaetic species from Scania, _Lycopodites scanicus_ Nath.[211] (_in litt._), recently re-described by Halle and originally referred by Nathorst to _Gleichenia_ affords another example of the occurrence of a small herbaceous lycopod of Rhaetic age. [Illustration: FIG. 137. _Lycopodites falcatus_ L. and H. From the Inferior Oolite of Yorkshire. (Nat. size. M.S.)] _Lycopodites falcatus_ Lind. and Hutt. Fig. 137. 1831 _Lycopodites falcatus_, Lindley and Hutton[212]. 1838 _Muscites falcatus_, Sternberg[213]. 1870 _Lycopodium falcatum_, Schimper[214]. In 1822 Young and Bird[215] figured a specimen from the Inferior Oolite rocks of the Yorkshire coast bearing “small round crowded leaves,” which was afterwards described by Lindley from additional material obtained from Cloughton near Scarborough as _Lycopodites falcatus_. The example represented in fig. 137 shows the dichotomously branched shoots bearing two rows of broadly falcate leaves. A careful examination of the type-specimen[216] revealed traces of what appeared to be smaller leaves, but there is no satisfactory proof of heterophylly. No sporangia or spores have been found. This British species has been recorded from Lower Jurassic or Rhaetic rocks of Bornholm[217] and a similar though probably not identical type, _Lycopodites Victoriae_[218], has been recognised in Jurassic strata of Australia (South Gippsland, Victoria). An Indian plant described by Oldham and Morris[219] from the Jurassic flora of the Rajmahal hills as _Araucarites_ (?) _gracilis_ and subsequently transferred by Feistmantel to Schimper’s genus _Cheirolepis_[220] may be identical with the Yorkshire species. The Jurassic fragments described by Heer from Siberia as _Lycopodites tenerrimus_[221] may be lycopodiaceous, but they are of no botanical interest. Other examples of Mesozoic Lycopods have been recorded, but in the absence of well-preserved shoots and sporangia they are noteworthy only as pointing to a wide distribution of _Lycopodites_ in Jurassic and Cretaceous floras[222]. From Tertiary strata species of supposed herbaceous lycopods have been figured by several authors, one of the best of which is _Selaginella Berthoudi_ Lesq.[223] from Tertiary beds in Colorado. This species agrees very closely in the two forms of leaf with _Selaginella grandis_, but as the specimens are sterile we have not sufficient justification for the employment of the generic name _Selaginellites_. Selaginellites.