— SI — 
gnor licer acciò possa ogni paleontologista giovarsi dei 
lumi di questo dotto botanico. Pistacia lentiscus , fig. 1 
1, and. 2. Piate LI. Several beautiful pinnated leaves. 
The generai lcaf-stalk is in some distinclly winged , fili- 
le in others it is hardly lo be observed. That tliis win- 
ged has not always bcen preserved, is proved by thè cir- 
cumstance that it sometimes exisls on one side and is 
* 
wanting on thè other. The stalli lies below tbis and forms 
a furrow, wliilst thè winged borders stand out a little or 
are placcd slanting against thè stalli. The leaves alter- 
nate, though for thè most part ncarly approximating; on 
each side four; rarely Uve, thè end leaves wanting. The 
leaves are lalhery, sessile, elliptical or long elliptical, nar- 
rowed at thè base, somewhat inaequilateral, generally thè 
upper side narrower than thè lower, as in Pistacia len- 
tiscus. From thè midrib proceed very delicate curved se- 
condary nerves, which are frequently cffaced. The size of 
thè leaves varics from 7 lines in length and 3 lines in 
breadth to as much as 14 lines in length and S \j -2 lines in 
breadth. The edge of thè leaves generally curled and 
agreeing with thè leaves of Pistacia lentiscus. Ist, in thè 
leathery structure of thè snrfacc of thè leaf; 2ndly, in thè 
number and position of thè lcaflels; 3rdly in thè forni of thè 
sessile leaves; 4lhly, in thè winged leaf-stalk ( in thè living 
species thè breadth of thè wing-border is very variable); 
Sthly, in thè nervation, and Glhly, in thè rolled edge of thè 
leaf. I think therefore, I bave good ground for referring 
these leaves lo thè maslic tree, allhough I was a long lime 
in doubt about them. — Remarcks on thè fossil planls from 
