with Descriptions of New Sp .' 1; , 



In these leaves the basilar nerves reach tl ral mar 



below the middle and with their »nd branches, as a 

 quence, have more the aspect of sum,, of the leai 

 pulifi rm, such as Corylus. The lattice-like arrangement ol 

 tertiary veins in this as in the other species of this grou 

 very characteristic of the OupidifercB, though nol v limi- 



ted to them. If we could imagine a Corylus with rounded or 

 broadly cordate leaves, of which the margins were entire, we 

 should have a very near approach t.. these plants. 



Formation and Locality. Lower Cretai 

 bird Hill, Nebraska. (Dr. Eayden.) 



Salix membranacea. (n. sp.) 



Leaves petioled, large, smooth and thin, lanceolate, long | oinU I. 

 rounded or abruptly narrowed at the base, near which t ; 



broadest ; margins entire, medial nerve slender, often corv< d, -• c I- 



ary nerves remote, very regularly and uniformly arched from their 

 bases, terminating in, or produced along the margins Till thi 

 tomose; tertiary nerves given off nearly at right angles, formii 

 very uniform network of which the areoles arc polygonal and • 

 quadrate. 



This is a strongly marked species, of which I ha\ e 

 fossilized in fine clay, and exhibiting with great distincti 

 the details of nervation. It was evidently thin and membi 

 ous in texture, though attaining a large -;/.<■. Like mo 

 willows, it is frequently unsymmetrical, one Bide 1" 

 developed and the midrib curved. 



The leaf is broadest near the base, and is the! 

 into a long and acute point. 



Formation <>/>>/ Locality. Lower < 

 River, New. Jersey. (Prof. < 



SaBix Meelfii. 



Leaves petioled, thin and delicate, Ian 

 nervation delicate, midrib slender, a cond 

 from the media! nerve at an an 



