36 DESCRIPTION OF SPECIES. 



their ends or by anastomosing branches, diverging under the teeth and 

 following the borders. By the size of the leaves and the distant obtuse 

 teeth this species is related to M. Thulensis, Heer, "Fl., Arct.," iii, p. 107, 

 pi. xxxi, fig. i; also closely allied by the nervation to M. apictdata, Sap. 

 "Sezanne Fl.," p. 342, pi. iv, fig. 5. 



Hah. — Two and a half miles north of Glasco, Kansas. Chs. Sternberg. 



Myrica? semiua, Lesqz. 

 "U. S. Geol. Eep.," ti, p. 63, pi. xxvii, figs. 4, 4a. 



BETULACEiE. 



BETULA, Toum. 



Betula Beatrlciana, Lesqz. 

 "U. 8. Qeol. Rep.," vi, p. 61, pi. v, fig. 5; pi. xxx, fig. 4. 



Betulites deuticulatus, Heer. 

 "Phyll. Ci^t. du Neb.," p. 15, pi. iv, figs. 5, 6. 



Leaves short, ovate, denticulate, rounded at base; lateral nerves diverging in 

 acute angle, craspedodrome, straight. 



The craspedodrome nervation relates these leaves to Betula or Alnus, 



though the form of the leaves recalls the type of Populus. 



Phyllites betulsefolius, Lesqx. 

 "U. S. Geol. Rep.," yi, p. 112, pi. xxriii, figs. 4, 7. 



ALNITES, Goepp. 

 Alnites g^randifolius, Newby. 



"Not«« on Ext. Fl.," Catal., p. 9; "DluBtr.," pi. It, fig. 2. 



The species is not described by the author. The figure represents a 

 large, round-oval leaf, narrowed to the petiole; the borders deeply regu- 

 larly undulate, the lateral nerves at an acute angle of divergence, much 

 branched on the lower side, craspedodrome like all the divisions. 



The leaf represents the type of Alnus glutinosa by its form and size; 

 but the borders are entire, merely undulate, not denticulate. The base of 

 the leaf is more acutely narrowed to the petiole than it is generally in 

 the leaves of this genus, 



Ilab. — Nebraska. Dr. F. V. Hayden. 



