XVIll] BOTHRODENDRON 257 



characters, they clearly represent a distinct type. This dis- 

 covery of a Stigmaria-like axis almost certainly belonging to 

 Bothrodendron is consistent with Nathorst's views on some of 

 the Bothrodendron impressions from Bear Island. 



Information as to the cones of this species is restricted to a 

 description by Schimper^ of a specimen in the Dublin Museum 

 as Lepidostrobus Bailyanus; this has sporophylls with a sub- 

 triangular base bearing several megaspores and terminating 

 distally in a slender lamina 12 cm. in length. 



An example of a Bothrodendron with more prominent leaf- 

 cushions than those already mentioned is afforded by a species 

 from Bear Island described by Heer^ as Lepidodendron 

 Wiikianum and afterwards referred by Nathorst^ to Bothro- 

 dendron. The same type' is recorded also by Schmalhausen* 

 from Lower Carboniferous or Devonian strata of Siberia. 

 Certain Scotch specimens from the Calciferous Sandstone, which 

 Kidston' referred to Heer's species, are regarded by Nathorst and, 

 in part at least, by Weiss' and Sterzel as representing a distinct 

 species which these authors designate Bothrodendron KidstonP. 



Without attempting the hopeless task of discriminating 

 between the various Carboniferous and Devonian specimens 

 described under the names Cyclostigma or Bothrodendron, 

 reference may be made to the following records as illustrating 

 the wide distribution of the genus. Schmalhausen* records 

 Cyclostigma kiltorkense from Siberian rocks assigned to the 

 Ursa stage (Devonian or Lower Carboniferous). The fossil 

 described by Dawson" from the Devonian of Gasp^ ds Cyclo- 

 stigma densifolium probably represents a badly preserved 

 example of Bothrodendron : Weiss's species Cyclostigma hercy- 

 nium^" from Lower Devonian rocks of the Hartz district may be 

 identical with Bothrodendron kiltorkense. The supposed identity 

 of the latter species with Dechenia Boemeriana Goepp., as de- 



1 Sohimper (70) A. p. 71. ^ Heer (71) PJ. vi. fig. 11 ; PI. ix. fig. 1. 



3 Nathorst (94) A. p. 67, PL xv. figs. 14, 15. 



* Schmalhausen (77) p. 281, PI. i. fig. 5. 



6 Kidston (89'^) PI. iv. figs. 2—4, p. 65. 



« Weiss and Sterzel (93) p. 56. ' Kidston (03) p. 823. 



8 Schmalhausen (77) p. 290, PI. i. figs. 7—12. 



» Dawson (71) A. Pi. vm. " Weiss, C. E. (84) PI. vii. 



