Pitcher ed Insectivorous Plants . 265 
CEPHALOTTJS. 
The pitchers of this genus appear to differ In every respect 
from those just passed under review, so that no comparison 
of them can be made. As Dickson clearly showed, the pitcher 
Is a laminar involution, while the lid is a flap of the lamina 
growing forward over it. Like many other Australian plants 
therefore it seems to represent one of a chain of forms other- 
wise lost to us. 
To tabulate briefly the foregoing conclusions we may say :— *■ 
I. That the leaf in Nepenthes , Heliamphora , Sarracenia , 
and Darlingtonia is compound, and consists of from two to 
five pairs of leaflets. 
II. That a marked tendency to dorsal fusion of the leaflets 
from apex to base is shown. 
III. That in seedling leaves of Nepenthes , and In seedling 
and adult leaves of Heliamphora, , one pair of leaflets is con- 
tinuous from the leaf-base up to the orifice of the pitcher, but 
that in adult Nepenthes , as also in Sarracenia and Darlingtonia , 
these separate into two pairs of leaflets, one pair being basal, 
and forming either elongated green laminae ( Nepenthes ) or 
membranous sheaths ( Sarracenia and Darlingtonia ). The 
upper pair is either continued up the front of the pitcher 
as two widely separated flaps which fuse distally ( Nepenthes ) 
or by close approximation and fusion of their faces they 
become a median dorsal wing ( Sarracenia and Darlingtonia). 
IV. That the pitcher is a deep dorsal involution of the 
midrib just above the termination of the fused upper pair 
of leaflets. 
V. That the lid is made up of two leaflets produced on 
either side of a median midrib, which may afterwards be 
excurrent (. Heliamphora , most species of Sarracenia), or the 
leaflets may fuse distally to form a median dorsal process, the 
midrib either passing off as a filiform process from which other . 
leaflets of a rudimentary nature spring (Nepenthes), or termin- 
ating in an abrupt point ( S . psittacina and D. calif or nica). 
