198 description of species. 



ROSIFLOREjE. 



AMELANCHIER, Medic. 

 Amelanchier typica, sp. nov. 



Plate XL, Fig. 11. 



Leaves subnieiubrauaceous, petioled, ovate, acute, serrate; nervation campto- 

 drome. 



This leaf seems to represent the living^. Canadensis in its more com- 

 mon or typical form, differing in nothing except the rounded base of the 

 leaf, which is generally slightly cordate in the living species. I say gen- 

 erally, for some of its leaves are also rounded just as in the fossil form. 

 The leaf, 8 centimeters long, 4 centimeters broad in the middle, has a 

 petiole 2 centimeters long. The nervation is similar, the lateral nerves 

 being only a little more distant. The average number of secondary nerves 

 in leaves of Amelanchier Canadensis is 8 to 11, while the fossil leaf has 

 only 9. But often large leaves of the living species have no more than 9. 



Hah. — Florissant. Princeton Museum, No. 691. 



CRATAEGUS, Linn. 

 Cratiegus aceri folia, sp. nov. 



Plate XXXVI, Fig. 10. 



Leaf petioled, lanceolate in outline, deeply lobate, irregularly dentate ; lobes lance- 

 olate, acuminate; nervation craspedodrome. 



The substance of the leaf is thickish, but not coriaceous ; the leaf is 

 gradually narrowed to the petiole, single-lobed on one side, the lobe being 

 longer, and twice-lobed on the other side, where the lobes are shorter — all 

 irregularly dentate. The secondary nerves are all craspedodrome, entering 

 I he lobes and the teeth ; but their divisions, at least near the points of the 

 lobes, are camptodrome, the borders being nearly entire. 



This leaf has the facies of an Acer. I find nothing in the fossil plants 

 described by authors to which it may be compared. 



Hab. — Florissant. Princeton Museum, No. 660. 



