25 
Populus kerri n. sp. 
Plate XII 
Description. Leaf subcircular, membranous, entire. Primary nerves 
3 in number, the laterals opposite and set at 50 degrees to 60 degrees to 
the midrib. These veins are strong proximally, but fade distally on 
approaching the margin. The median nerve is nearly straight and runs 
to the margin; the two laterals and the secondaries are camptodromous. 
The laterals are straight and unbranched for about three-fifths of their 
length; beyond they become faint, branched, and follow a zigzag course. 
Four or five secondaries alternate on each side of midrib, set at a very 
wide angle to the latter, but curving upward; branching is rare and only 
distally. A pair of secondary basilar veins lie below the primary laterals. 
Remarks. Populus dakotana Cockerell is veined on a somewhat 
similar pattern to P. kerri , except that the laterals are all pinnate. The 
leaf blade too is more cordate in outline. 
Types. Holotype, 164; National Museum of Canada, Ottawa. 
Myricat sp. 
Plate X, figure 1 
Oblanceolate coriaceous leaves, several centimetres long, cuneate 
and probably decurrent at base, broad and rounded at apex, resembling ■ 
Myrica schimperi Lesquereux. Border entire, smooth. Midrib pronounced, 
percurrent; secondary veins rather faint, camptodromous, alternate to 
subopposite, about a centimetre apart in middle of leaf. 
Types. Holotype, 169. National Museum of Canada, Ottawa. 
CORRELATION 
Asplenium dicksonianum when used as a name for sterile shoots such 
as those from this locality is a form genus that has a long vertical range 
in the Cretaceous. Aspidiophyllum irilobatum has hitherto been reported 
from the Dakota group of Kansas and from the Raritan of the Atlantic 
coastal plain. As the remaining species are new nothing may be said about 
their range in time. On the whole the assemblage of plants, although 
meagre, suggests an Upper Cretaceous age, and, more probably, a 
Cenomanian or Turonian rather than a later age. 
45722—3 
