DESCRIPTION OF SPECIES— MYRICACE^. 131 



4 of our plate, however agreeing with the denticulation of the leaves in figs. 

 2 and 3. This appears to be a mere variation; for the specimens sent for 

 determination are numerous, and show many differences in the forms of the 

 leaves and the denticulation of the borders, even upon the same leaf; one of 

 them, for example, represents a long acuminate leaf, with equally serrate 

 borders on one side, while on the other the teeth are close and unequal. As 

 the specimens from one of the localities mentioned below have much smaller 

 leaves, shorter and narrower than those described from Europe, ours may 

 represent a different species. Saporta considers it as rather allied to M. ar- 

 guta, Heer, and M. Zacchariensis, Sap., both Miocene. 



Habitat. — Middle Park, Colorado {Dr. F. V. Hayden). One mile west 

 of Florissant, Colorado {Dr. A. C. Peale). Mouth of White River, Utah 

 {Prof. W. Denton). 



iTIyrica Copeana, Lesqz. 



"piatc XVII, Fig. 5. 

 Mjjrica Copeana, Lesqx., Annual Report, 1873, p. 411. 



Leaves laDceolate, taper-pointed, rounded to tlio base, deeply doubly serrate ; nervation penni- 

 nerve, craspedodronie. 



A fine leaf, of which there is only one specimen, about eleven centime- 

 ters long (the point and base are destroyed), three and a half centimeters 

 broad below the middle, lanceolate, gradually acuminate, rounded or truncate 

 to the base, doubly serrate, with sharp long teeth turned up, and alternate 

 smaller ones, the first entered by the secondary veins, the others by their 

 branches or hy thinner shortened secondary ones. The lateral nerves are, 

 near the base, nearly at right angle to the midrib, and some of them branch- 

 ing once; the upper veins at a more acute angle of divergence are all simple, 

 and the border teeth become simple also and equal. The areolation mostly 

 obsolete, discernible only at a few places, where a thin coating of coaly matter 

 covering the surface is erased, is in small quadrangular meshes, oblique to the 

 secondary nerves. The consistence of the leaf is not very thick, not coria- 

 ceous. This species is distantly comparable to Myrica Graffil, Heer, FI. 

 Tert. Helv., iii, p. 176, pi. cl, figs. 19, 20. 



Habitat. — Near Florissant, Colorado {Prof. E. D. Cope). 



myrica undiilata}, Heer. 



Plate XVII, Figs. C-8. 



Myrica undalaia,Y{w.r, Fl. Tert. Helv., iii, p. 188, pi. cliii, figs. 21-22. — Lesqx., Annual Report, 187.3, p. 412. 



Leaves subcoriaceous, ovate- lanceolate or liuear-lauccolate, acuminate, narrowed to a short peti- 

 ole; borders regularly and deeply undulate; nervation camptodrome. 



Leaves variable in size, about five centimeters long, one to two centime- 



