LEPIDOPHLOIOS, AND ON THE BRITISH SPECIES OF THE GENUS. 541 



included in Sigillaria (sub-genus Clathraria)," though he still includes all these under his 

 Lepidophloios. 



1888. Lepidophloios, Zeiller. Flore foss. d. bassin houil. d. Valenciennes, p. 470. 



Zeiller describes the genus as having the leaf-cicatrices always placed below the 

 middle of the cushion, or even at the inferior angle. 



With Lepidophloios he unites Lomatophloios and Halonia — the latter as its fruiting 

 branch. 



He treats Halonia, however, as a provisional genus, simply from the circumstance 

 that we can seldom identify the Halonian branches with their parent stems, on account 

 of their bark being so seldom preserved, and consequently, from its absence, the necessary 

 characters for a specific identification are wanting (loc. cit., p. 475). 



1889. Williamson. " On the Organisation of the Fossil Plants of the Coal Measures," 



Part XVI., Phil. Trans., vol. clxxx. p. 200. 



Prof. Williamson here supports the view that Halonice are fruiting branches. The 

 tubercules on Halonia are the result of arrested plant-growth, and are morphologically 

 identical with the Ulodendroid scar. 



1890. Lomatophloios, Eenault. Flore foss. le terr. houil. de Comentry, deux, part, 



p. 507. 



Eenault here treats Lomatophloios as distinct from Lepidophloios, accepting the 

 upward directed leaf-cushions, with leaf-cicatrice at their upper extremity, as the out- 

 standing point of separation of Lomatophloios from Lepidophloios, where, in the latter 

 genus, the leaf-cushions are bent downwards, and the leaf-cicatrice placed at their lower 

 extremity. According to this author, the leaf-cushion is also less developed in Lepido- 

 phloios, but this character we shall find does not hold good. He also unites to Lepido- 

 phloios the genus Halonia, which he regards as the fruiting condition, the cones having 

 been attached to the mamelons. 



1890. Halonia, Grand' Eury. Geol. et paleont. du bassin houil. du Gard., p. 235. 



Without expressing any conclusive opinion, Grand' Eury seems to favour the opinion 

 that Halonia is a rhizome of Lepidodendron. 



1890. Seward. " Notes on Lomatophloios macrolepidotus (Gold.)," Proc. Cambridge 



Phil. Soc., vol. vii. 

 Mr Seward here shows that the specimen described by the late Dr Weiss (ante, p. 

 540), from Langendreer, Westphalia, and which Weiss regarded as a cone of Liomato- 

 phloios, was in reality a part of the bark of that plant, and not a cone. 



