T °i889."'] PROCEEDINGS OF THE NATIONAL MUSEUM. 617 



whole ray having a height of 76.5 to 379.9/t; individual cells are 15.3 to 

 24.5/* (average of one hundred and ninety cells 20.64/*) in diameter, 136 

 to 192/* (average 152/*) long, and about 20/* broad ; the medullary rays 

 are provided with numerous very large, roundish or elliptical pores, 

 which have a breadth of 10 to 64/* and a height of 10 to 20/*. 

 Habitat. — Green Harbor, Spitzbergen. 



11. Araucarioxylon Hiigelianum Kraus. 



Schimp. Pal. Veg., n, p. 384. 



Pinites Hiigelianus Gopp. in Bronn's Gesch. d. Nat., Vol. in, pt. 2, p. 40; Monog. 

 d.Foss. Conif., 1850, p. 214. 



Concentric circles (2 mm broad) indistinct ; trache'ids all thick walled ; 

 pores small, in a single contiguous series or separated ; medullary rays 

 numerous, simple, of two to twenty-four narrow superimposed cells. 



Habitat. — Tasmania. " Formation probably oolitic." Schimper. 



12. Araucarioxylon subtile (Merckl.) Kraus. 



Schimp. Pal. Veg., u, p. 384. 



Araucarites subtilis Mercklin in Paleodendrologicon ross., 1856, p. 54, PI. XI. 



Concentric circles distinct, 5 to 7 mm broad; the cells thin walled; 

 pores spirally disposed in two series, contiguous, angled, small, or in a 

 single series, being there subrectiliuear, oval and remote; internal pore 

 very small ; medullary rays numerous, in a single series of one to fifteen 

 superimposed cells. 



Habitat. — Eastern Eussia. (Siberia 1 ?) 



13. Araucarioxylon Mollhausianum Gopp. Sp. 



Araucarites Mollhausianus Goppert, in Mollhausen's Tagebuch einer Reise vom 

 Mississippi nach den Kiisten der Siidsee. Leipzig, 1858, p. 492. 



This species was not described by Goppert and consequently can not 

 be identified. It is possibly the same as Araucarioxylon Arizonicum 

 Knowlton (ante p. 614). 



Habitat, — New Mexico. 



DOUBTFUL SPECIES. 



Dadoxylon Sternbergii Endl. 



Synops. Conif., p. 300. Araucarites Siernlerglh Goppert, in Brown Gesch. d. Nat., 

 ill, 2, p. 41. 



Araucarites Edwardianus Gopp. 



SeeBeust Untersch. ii. foss Holzer aus Gronland ; (Neue Denkschrifteu, Bd. xxix, 

 1884) Ubersichts Tab. i. 



U. S. National Museum, January, 1889. 



