530 MR ROBERT KIDSTON ON 



Sternberg originally placed Lepidophloios in Lepidodendron (Lepidodendron lari- 

 cinum, ibid., vol. i. fasc. 1, p. 23, 1820), but subsequently recognising its important 

 generic differences, founded for it his genus Lepidophloios. 



1833. Lindley and Hutton. Fossil Flora, vol. ii. pp. 11 and 14. 



The authors of the Fossil Flora had very indefinite ideas as to the affinities of their 

 genus Halonia. Their first described species is Halonia tortuosa (pi. lxxxv.), though 

 the generic characters are more fully stated in their description of Halonia gracilis * 

 (pi. lxxxvi. p. 14). They state, in explanation, " the genus Halonia is proposed to com- 

 prehend all those fossils, in which to the surface of Lepidodendron, is added the mode 

 of branching of certain Coniferse, and which, it is therefore to be inferred, were of a nature 

 analogous to the latter." 



It will presently be shown that the leaf-scars and cushions of Halonia are quite 

 distinct in structure from those of Lepidodendron, and that its ramification is 

 dichotomous as in other Lycopods. The genus has, in fact, no affinity with the 

 Coniferse. 



On their Halonia tortuosa the leaf-scars are not shown, and on their Halonia 

 gracilis (which I much doubt being generically identical with their Halonia tortuosa)^ 

 they are also indistinct ; hence their statement in the generic description " to the surface 

 of Lepidodendron," can only have been an assumption on their part. 



1836. Pachyphlceus, Goppert. Diefoss. Farrnkrduter, p. 468. 



Under this name Goppert places fragments of two distinct genera. His figures 1-4, 

 pi. xliii., are referable to Lepidophloios, but his figure 5, though found in the sameblock, 

 had no organic connection with the examples which form the subjects of his figures 1-4, 

 and is a Ulodendroid scar, which may probably belong to a Lepidodendron. 



1845. Lomatofloyos, Corda. Beitr. z. Flora d. Vorwelt, p. 17. 



Corda thus describes his genus : — f 



" Truncus arboreus medullosus, columnaris ; ramis tetrastichus spiraliter positis. 

 Cortex squamosa, squamis spiraliter spositis quaternariis (\), carnosis, crassis, truncatis, 

 erecto-patentibus imbricatis, phyllophoris, dein cicatricibus rhomboideis infra appendicu- 

 latis, fasciculis vasorum ternis ccntralibus horizontalibus ornatis, obtecta. Corpus corticalc 

 medullosum, crassum, fasciculis vasorum percursum. Corpus ligneum cylindrieum, 

 cavum, tcnuissimum, e vasis scalariformibus simpliciter compositum, radiis medullosis 

 cellulisque lignosis nullis. Medulla centralis farcta, transversa striata. Folia linearia ; 

 nervo medio simplici. Fructus simplex (?) nucleiformis, supra acuminatus." 



* This species appears to me to be much more probably a Lepidodendron, with unequally developed dichotomy, 

 than a Ifulmiia. 



t First proposed by Corda in Sternberg, Flora d. Verwelt, vol. ii. p. 206, 1836. INot having had access to 

 Corda's addition to Sternberg, I base my remarks on Lomatofloyos from Corda's description and figures in this 

 work. 



