Insectivorous Plants ( Part II). 423 
Veitchii , in which the pitcher-rim has not only enlarged greatly, 
but gradual increase in the size of the lid and of the marginal 
glands, increase in depth of the conducting surface and in 
strength of the pitcher-substance, have all proceeded simul- 
taneously, and culminated in the last-named, which may fairly 
be viewed as the most highly-developed species of the genus. 
N. Rajah and N. Boschiana , in the relatively small size of the 
marginal glands and feeble development of conducting surface, 
show close relationship to N. Veitchii , though in the size of 
the pitcher and of its lid and rim as well as in coloration, they 
mark a decided advance on it. 
Another and a very interesting line passes to the isolated 
species N. echinostoma, which, in the possession of a functional 
conducting surface as well as in the disposition and size of its 
glands, is more specialized than N. Rafflesiana , but is singular 
in having a reduced reflected lid with large glands, and in 
having the ridges of the collar split up into narrow tapered 
processes that curve round the orifice of the pitcher. Each 
carries a marginal gland at its free extremity. Another line 
leads us to N. sanguinea and N. Northiana , that show strong 
vegetative growth and richly coloured pitchers. These 
pitchers show richly honeyed lids, waved collar with cylindrical 
marginal glands, and conducting surface of considerable 
depth. 
Again, N. Bongso , by its reduced vegetative state, narrower 
rim, less elevated posterior beak, and other peculiarities, leads 
us to a series such as N. tentaculata , N. gracilis , N. alata , and 
N. distillatoria , all characterized by an abundance of lid-glands, 
narrow reduced collar, that carries correspondingly reduced 
marginal glands, and gradually deepening conducting surface, 
which in the last is from one half to two thirds the depth of the 
pitcher. N. Pervillei , N. laevis , and N. Vieillardii appear to 
be in structure divergent forms from these. The closely related 
species, N. Phyllamphora , N. khasyana , N. Madagascar iensis , 
and N. Kennedyana , are all highly evolved forms in which 
the long tubular pitchers, richly honeyed lids, large sausage- 
shaped marginal glands, and deep conducting surface, suggest 
