with Descriptions of New s 7 Phi 



PEataatiiK lafiloba. (n. 



Leaves petiolate, three-lobecl, decurrent at the base, lobes broad, 

 obtuse, or abruptly acuminate ; principal a irv< 3 three, lary 



nerves issuing from these at an acute angle, tertiary oerves Leaving 

 the secondary at a right angle, forming a network over the Burfacc 

 of the leaf, ofwhich the areola' are subquadrat 



Judging from the imperfect specimens which we have of this 

 species, it is quite distinct from any described. Having the 

 general form and nervation of the leaves of /'. • <<}, ntalis, the 

 margins are much less deeply sinuate, the lobes less acuinin 

 and the entire outline of the leaf more simple. T same is true 

 of its relations with P.orientalis of the old world. The f 

 species, of which several have been described by linger and 

 Goeppert, are quite distinct from this. The speci< 8 det i by 



linger (P. Sirii and P. grandifoUd) are much more deeply 

 lobed, while that figured by Ileer, Goeppert and Ettingshau 

 (P. aceroides) is less deeply lobed but more strongly toothed. 

 All fossil species heretofore known are from the Tertiary 

 this being the first instance where the genus has been found in 

 rocks of the Cretaceous epoch. 



During the last summer (1858) I obtained specimi i 'ill 



another species from the same geological formation in > 

 Mexico. This has a larger and more lobate leaf, mo the 



Tertiary species P. grandifolia. 



Formation and Locality. Lower Cretaceon 

 Blackbird Hill, Nebraska. < Dr. Hayden. | 



Fag"* cretacea. (n. sp.) 



This pretty species is represented in the collccti 

 single specimen. This is, however, remarkably well | 

 giving the general form and the details of nervation 

 distinctness, from the character of t : 

 little hesitation in referring it to tl 

 the iZAawmamB, particularly species of Rh 

 have leaves which would be very lil I "-iff 



