262 DESCRIPTION OF SPECIES. 



CORNER. 



Cornus Orbifera, Heer. 

 "U. S. Geol. Hep.," vii, p. 243. 



The specimen referable to this species has the lateral nerves curving 

 inward along the borders, anastomosing with the upper ones by nervilles 

 at right angles, as in Heer, "Fl. Tert. Helv.,"' pi. cv, fig. 16. Heer has also 

 described the species from Spitzberg specimens. 



Hob. — Cook Inlet, Alaska. 



MAGNOLIACE^E. 



Magnolia Nordenskioldi, Heer. 



"Beitriige Zur. Foss. Fl. Spitzb." ("Fl. Arct.," iv), p. 82, pi. xxi. fig. 3; xxx, fig. 1. 



Leaves large, tbickish, oval, obtuse, entire, emarginate or shortly aurieulate at 

 base ; secondary nerves distant, curved in traversing the blade, forking near the 

 borders. 



From the numerous well preserved specimens of this beautiful species 

 I have been able to complete the diagnosis of Heer, made from frag- 

 mentary leaves. The leaves are longer than those of M. ovalis, Lesqx., 

 to which Heer compares this species, and also subauriculate at base or 

 emarginate ; the surface is rugose, crossed at right angles to the veins by 

 simple or forked nervilles. The two lower pairs of veins are closer than 

 those above. In a leaf of medium size the two lower pairs of nerves are 

 8 millimeters distant, while those of the middle are nearly 2 centimeters. 

 The angle of divergence in joining the midrib is open, but the nerves are 

 much curved upward in traversing the blade. 



These leaves, like those figured from Alaska Spitzberg, have the 

 surface diversely marked by tracks of worms or insects, which appear to 

 have dug narrow flexuous channels into the parenchyma or under the 

 epidermis. 



Hab. — Chicknic Bay, Oliaska Peninsula, Alaska. 



