DESCEIPTION OF SPECIES— MYRIOACE^. ] 35 



one, as most of the species of fossil Comptonia have their lobes entire. M. 

 Matheroniana, Sap., of the Armissan of France, has its lobes somewhat den- 

 ticulate toward the point. 



Habitat. — Elko, Nevada {Prof. E. D. Cope). 



Myrica Brong^niarti!, Ett. 

 Plate XVII, Fig. 15. 

 Driartdra Brongmarti, Ett., Foss. Fl. von Hiir., p. 55, pi. xix, fifjs. 1-26. 

 Mi/riea Bronf/niarti?, heaqx., Auuual Kepoit, 1873, i>. 418. 



Leaf linear, pinuatuly divided into short, slightly obtuse lobes; nervation obsolete; secondary 

 veins craspedodrome. 



This fragment is still too incomplete for a satisfactory determination. 

 The leaf is coriaceous, the details of nervation obsolete, and by its lobate 

 borders it is intermediate in characters between the leaves described as Dri- 

 andra Brongnarti, Ett. (Joe. cit.), especially like fig. 20, and those of Myrica 

 opiiir, Ung. (Fl. v. Sotzka, p. 30, pi. vi, figs. 12-16). 



Habitat. — Elko, Nevada {Prof. E. D. Cope). 



Myrica ■nsig:iiis, Lesqz. 

 Plate LXV, Figs. 7, 8. 

 iTyrica iasignis, Lesqs., Auuual Report, 1874, p. 312. 



Leaves large, membranaceous, narrowly oval or obloug, acuminate, narrowed to the base, pin- 

 nately lobed ; lobes short, deltoid, acute, turned upward ; middle nerve thin ; secondary veins open, par- 

 allel, alternately passing up to the point of the lobes or to the base of the sinuses; areolation large, 

 polygonal. 



The two fragments of this beautiful leaf sufficiently represent its char- 

 acters. The size is about ten centimeters long, nearly four centimeters broad 

 in the middle, where the lobes are equal, divided to about one-third of the 

 space between the middle vein and the borders, the two upper pairs being 

 much shorter and longer, and the terminal one sharply acuminate, two centi- 

 meters long. As far as it can be seen at the base of fig. 7, the lower lobes are 

 rapidly diminishing in size downward, and the lowest one is narrowed down- 

 ward and slightly decurrent to the petiole. The nervation is perfectly dis- 

 tinct ; the secondary veins, on an open angle of divergence of about 60°, 

 mostly parallel, are mixed, the principal ones passing up in a slight curve to 

 the point of the lobes; the others, quite as thick, going up to the base of the 

 sinuses, where they divide into two branches, curving and anastomosing along 

 each border, with fibrillse, which, broken and branching in the middle of the 

 areas, form large quadrate or irregubrly polygonal areolae. This nervation 

 has the true character of that of the Comptonm, l)ut no fossil species offers 

 a point of comparison for this one. 



Habitat. — Florissant, Colorado {Dr. F. V. Hayden). 



