246 Mr. B,. Kidston on the Relationship 



and many specimens from the Calciferous-Sandstone series, 

 from which horizon Brongniart's example evidently origi- 

 nated, show the same characters. The peculiar appearance 

 of the fossil to which the name of Selaginites patens has 

 been given is caused by the basal portions of the leaves still 

 retaining their attachment to the stem ; and in other cases I 

 have observed a very similar appearance produced by the 

 leaves being adpressed (probably through mechanical agency) 

 to the branches. Although not for a moment doubting that 

 the specimens to which I refer are similar to that figured in 

 vol. ii. pi. xxvi. of the Hist. d. vdget. foss., examples with 

 such an extremely scaly appearance are rare ; but I have two 

 at least in which it is as well marked as in the type figure of 

 Lepidodendron patens J Brongn. sp. 



gchmalhausen has united Lepidodendron glincanum^ Eicli- 

 wald, and Lepidodendron Volkmannianum, Sternberg, with 

 Lepidodendron Veltheimianum, Sternberg *. 



With regard to Lepidodendron glincanum^ I cannot find 

 any point by which it can be separated from Lepidodendron 

 Veltheimianum^ and therefore include it under that name. 

 Lepidodendron Volkmannianum seems an altogether distinct 

 species, and cannot be united with Lepidodendron Veltheimi- 

 anum. 



Lepidodendron {8agenaria) glincanum^ Eichwald, Lethssa 

 Eossica, pi. V. a, fig. 7, should perhaps be referred to Lepi- 

 dodendron Volkmannianum. 



Lepidodendron {Sagenaria) aculeatum, Feistmantel and 

 Goppert, Lep>idodendron Sternhergii and Lepidodendron 

 selaginoides^ Heer, and Lepidodendron (Sagenaria) caudatum, 

 Geinitz and Romer f, are all, I believe, referable to Lepido- 

 dendron Veltheimianum. 



Lepidodendron Jaschei a,nd Lepidodendron gracile, Romerf, 

 are both young conditions of Lepidodendron Veltheimianum. 



The transverse bars that occur on the leaf-scars of Lepido- 

 dendron gracile have most probably been produced by shrink- 

 age, and are frequently present on other species of Lepido- 

 dendron. 



Bergeria regularis and Bergeria alternans^ Schmalhausenf, 

 only appear to represent different conditions of preservation of 

 Lepidodendron Veltheimianum. 



The core which lifted out of an impression of Lepidoden- 

 dron Veltheimianum in my own collection agrees so entirely 



* Mem. de I'Acad. d. Sc. de St. P6tersl»ourg, 7^ st§r. vol. xxxi. no. 13, 



p. 11. 



t For figures specialh^ referred to see synonyms given on pp. 243-246. 



