1 8 /. '■ i /.' ' i ■ ' / ' North Ann ri . 



Popidits, from the generalities nervation, and impressions 



of what would Beem to have Itch glands at the base on either 

 Bide of the point "t' insertion of the petiole. In our specimens, 

 however, there are no glandular impressions, and the departure 

 from flif normal type of nervation in Pqpulus, noticed by 

 Prof. I [eer, Is >till more conspicuous. 



I strong pair of basilar nerves, so characteristic of the pop- 

 lars, is entirely wanting; the inferior lateral nerves being 

 small, and the Btronger "ins which succeed them above, are 

 In view of the marked departure which these 

 Leaves exhibit from the nervation and form of the typical pop- 

 lars, Prof. Heer Biiggests that they may represent an extinct 

 gen us of the order SalicinecB^ hut it seems to me their affinities 

 are closer with the Magnoliaa ce, and that it is even probable thai 

 they represenl a Bp< I the genus Magnolia. 



Formation and Locality. Lower Cretaceous sandstone, 

 Blackbird Bill, Nebraska. (Dr. Eayden.) 



Poi>iihi*( f) 4 ordyfl'oEs;). (n. Bp.) 



Leaves heart-shaped, slightly decurrenl on the petiole; margins 

 entire; nerves fine bul distinctly defined; medial nerve straight or 

 Blightly curved, running to the margin; lateral nerves 6 on each 

 side, given offal an angle of about 50°, nearly parallel among 

 themselves, st raighl near the base of the leaf, slightly curved toward 

 the summit ; lower lateral nen ea giving off on the lower side aboul 

 4 simple or once fo ked, slightly curved branches which terminate 

 in the basilar margin ; Becond pair of lateral nerves giving off aboul 

 three Birailar branches on the lower side, which run to the lateral 

 margins; third pair supporting aboul two, and fourth pair one 

 branch on the lower side near the Bummit; tertiary nerves spring- 

 ing from the secondar) nearly at right angles, slightly arched and 

 running near!) parallel to conned the adjacent secondary 



n< n 



I genera] aspect thi ely resembles the pre- 



. but Beveral specimens which I have before me agree in 



■ ounded and mor< In art liape I, and the lateral 

 arc more numerous and given ofl at a lamer angle. 



