Lot Extinct /'"/" Ybrth Ameri 



Formation <//*</ Locality. I. 'unite Tertiary beds, Mouth of 

 \ ■ ..■ ■. stone Rn er. 1 >r. I [ayden. | 



SapiBdut membraiiaceiis in. sp.) 



Leaves pinnate in many pairs of leaflets, and terminating in a 

 ovate, often unsymmetrical one; lateral leaflets lanceolate, 

 acute, wedge-shaped at base, unsymmetrical, thin and membraneous, 

 u ith entire margins ; nervation fine and Bparse, many pairs of lateral 

 nerves being given <>fV by the midrib (from which also spring many 

 ill lateral branchlets), and, these arching upward inosculate near 

 the margin <>r <lic but. 

 This is Bimilar in nervation and in the general form of the 

 ral leaflets to the preceding Bpeciea {S. affinis\ but the 

 whole plant is more delicate, the leaf thinner, the nervation 

 finer, the terminal leaflet Beveral times as large and of a dif- 

 ferent form. 



"Formation and Locality. Lignite Tertiary Btrata. Fort 

 .11. Dae -tali, I Dr. Flayden.) 



Tilia aiiliqiia in. Bp.) 



I 5 inches long, nearly as wide, often Bomewhat unsym- 



metrical, cordate at base, abruptly acuminate at summit, coarsely 

 and in arly equally toothed : nervation Btrong, medial nerve straight, 



Lateral nerves, which diverge at an angle of 

 about I The basilar pair of lateral nerves each sending off i 

 branches on 1 1 » < - lower side, which ate again branched and termi- 

 in the teeth of the margin. The second pair of lateral nerv< - 

 have eaeh t similar branches, the third pair ■'-. the fourth pair ~j. 

 tin fifth pair I, though there are frequent departures from tlii^ 

 ml, , '|"1m' tertiai j • are strongl) marked, l> a\ ing the second* 



;i r\ ■ ■ nearlj at righl angles, crossing directh between tin' 



cent ones, or anastomosing with some irregularity in the mid- 

 dle of the ii 



There are many fragments "t these leaves in tin collection 



»re me, imbedded in a verj line ami hard argillaceous lime- 



and verv beautifully preserved. They exhibit consid- 



inblanco to the leaves of M , especially M.^rtibra^ 



but in that plant the basilar nerves of tin- leaves art- more de- 



i ach tin- margins higher up. The marginal 



