( 66 ) 
The figure (p/. 43. 4 4) shows the appearance of the main 
stem of a fragmentary specimen which might readily enough 
be taken for the pinna of a fern. 
The markings on all the specimens are very obscure and 
it is only after the carbonized layer has dried out and blown 
away that they show plainly the leaf-markings as shown in 
the balance of the figures. No fruit has anywhere been found 
associated with these twigs, so that their exact relationship 
remains to be determined. Judging from the foliage alone 
Heer is inclined to place it among the Cupressineae and near 
to Libocedrus. 
Libocedrus Endl. is unknown from the American Creta- 
ceous or later formations, although the existing incense 
cedar, Libocedrus decurrens Torr., ranges from Oregon 
southward to southern California and is commonly cultivated. 
This typically northern genus reaches Australia through the 
East Indian region and penetrates far into South America 
along the Andes, thus almost surrounding the Pacific. Heer 
has described three fossil species from the Arctic regions, 
Libocedrus gracilis from Spitzbergen, Libocedrus cretacea 
from the Atane schists (Kardlok, Isunguak), and Zibocedrus 
Sabinzana from Greenland (Atanekerdluk B, Naujat, Kug- 
sinek, Haseninsel, Isunguak) and Spitzbergen. 
ARACEAE. 
ArisAEMA Martius, Flora, 14: 459. 1831. 
There are about fifty existing species, mostly of temperate 
and tropical Asia; three in eastern North America. Two 
fossil species have been provisionally referred here as fol- 
ows: 
ARISAEMA CRETACEUM Lesq. PI. 46. f. 4. 
Arisaema cretacea Lesq. Fl. Dak. Group, 38. p/. 46. f. 1. 
1892. 
Arisaema (?) dubia Hollick, Trans. N. Y. Acad. Sci. 16: 
130. Pl. 12. f. 6. 1897 
The above species was founded by Lesquereux for a 
