CARBONIFEROUS LYCOPODS AND SPHEXOPnYLLS. 39 



which it can be suitably placed. I have therefore been under 

 the necessity of creating the genus Archceosigillaria for its 

 reception. 



Archceosigillaria is distinguished from Lycopodites by the con- 

 tiguous and distinct leaf-scars, which become hexagonal on the 

 older stems from mutual pressure, and the apparently much larger 

 growth of the plant ; from Lepidodendron by the absence of a 

 leaf-cushion and lateral cicatricules (parichnos) of the leaf-scar, 

 and from Sigillaria by its single central vascular-scar, unaccom- 

 panied by the two lateral lunate parichnos. The small deltoid 

 lanceolate leaf agrees with that of some species of Lycopiodites, 

 but not with the leaves of Lepidodendron or Sigillaria. 



ArcJueosigillaria forms, therefore, a genus clearly separated 

 from all the other genera of Palceozoic Lycopods. 



From our imperfect knowledge of Archoiosigillaria Vanuxemi 

 and complete ignorance of its fructification, its systematic position 

 is uncertain, but its place is probably in the Lycopodiales, and I 

 provisionally place it there beside Lycopodites. 



Archceosigillaria Vanuxemi, Giippert sp. 



1842. Vanuxem. Geol. of JVew York, Part III., p. 184, fig. 51. 



1852. Sigillaria Vanuxemi. Gopp. : Foss. Flora d. Ubergangt, 

 p. 249. 



1862. Sigillaria Vanuxemi. Dawson : Quart. Journ. Geol. Soc, 



Vol. XVIII., p. 307, PL XII., fig. 7. 



1863. Sigillaria Vanuxemi. Hall: 16th Annual Bept. of Condi- 



tion of State Cabinet of Nat. Hist., pp. 99 and 113, 

 fig. 5. Albany. 



1871. Sigillaria Vanuxemi. Dawson: Foss. Plants of Devon a^id 

 Upper Silur. Form, of Canada, p. 21. 



1880. Sigillaria Vanuxemi. Lesquereux: Coal Flora, Vol. II., 

 p. 505. 



1887. Sigillaria Vanuxemi. Weiss: Sigillarien d. Preuss. Stein- 

 kohlengebiete, I. Gruppe der Favularien. Konig. Preuss, 

 Geol. Landesanstalt, Berlin, p. 65 (291), PI. IX. (XV.), 

 fig. 30. 



