106 DESCRIPTION OF SPECIES. 



This definition merely relates to the peculiar leaves described below, 

 whose relationship is marked only with leaves of some species of Lomatia. 

 Their texture is thick. The surface is always covered by a coaly layer, 

 obliterating the nervation. 



Lomatia hakoa'l'ol ia, sp. nov. 

 Plate XXXII, Fig. 19. 



Leaf obliquely truncate at base, lanceolate, acuminate, irregularly deeply deutate. 



This form differs from the following by the segments, or lobes, being 

 shorter and directed to the outside at right angles to the primary nerve; 

 these acute short lobes or teeth, four on each side, are opposite and sepa- 

 rated by broad shallow sinuses; no trace of secondary nerves is discernible. 



i/rt5._Florissant; rare. U. S. Geol. Expl. Dr. F. V. Hayden. 



Lomatia spinosa, sp. nov. 

 Pl.ite XLIII, Fig. 1. 



Leaves narrowly lanceolate, long-acuminate, broadly alternately acutely dentate- 

 lobed ; divisions gradually shorter upward, the terminal long-acuminate. 



Related to the preceding species but differing by the lacinia^ being 

 longer, turned upward, decurrent. The primary nerve is scarcely visible. 

 //rtJ._Florissant; rare. U. S. Geol. Expl. Dr. F. V. Hayden. 



Lomatia terminalis, sp. nov. 

 Plate XLin, Figs. -2-7. 



Leaves linear-lanceolate, acuminate, deeply lobate ; lobes oblique, lanceolate, 

 acute, decurrent along the primary thin nerve; lateral nerves generally distinct. 



Hah.—\N\\h the preceding; not rare. U. S. Geol. Expl. Dr. F. V. 



Hayden. 



Lomatia tripartita, sp. nov. 



Plate XLIII, Figs. 8-10. 



Leaves palmately trilobate, narrowly cuneate to the base; lobes obliquely diverg- 

 ing, oblong, obtuse or obtusely pointed, entire or dentate-lobed on one side; primary 

 nerves more or less distinct. 



The three fragments representing this species may be mere forms of 



the preceding. 



Hah.— Florisssini; rare. U. S. Geol. Expl. Dr. F. V. Hayden. 



