{66) 



The figure (pi. 4.3- /> 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. 



Lihocedrtis Endl. is unknown from the American Creta- 

 ceous or later formations, although tjie existing incense 

 cedar, Libocedrus dccitrrens 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 cretacca 

 from the Atane schists (Kardlok, Isunguak), and Libocedrus 

 Sabiniana 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- 

 lows : 



Arisaema cretaceum Lesq. PL 4.6. f. 4. 



Arisaema cretacca Lesq. Fl. Dak. Group, 38. fl. 46. f. i. 



1892. 

 Arisaema (P) dubia Hollick, Trans. N. Y. Acad. Sci. 16 : 



130.//. 12. y. 6. 1897. 

 The above species was founded by Lesquereux for a 



