— Plate 7. — 



Figs. 1-25. — Nepenthes. 



Figs. 1-6. — Developmental series of the pitcher leaf. 



Fig. I. — Very young stage (after Hooker 1859). 



Fig. 2. — Somewhat later stage, the lid having appeared (after Hooker). 



Fig. 3. — Longitudinal section of a still later stage showing lid appressed 

 to the rim (after Hooker). 



Fig. 4. — The origin of the lip as a two lobed structure (after Bower). 



Fig. 5. — Definitive form of the first seedling leaf (after Stern). The 

 transverse stipular juncture is represented by emergencies. 



Fig. 6. — A similar stage of development (after Macfarlane), in which 

 the transverse stipular membrane is evident. 



Fig. 7. — • Front and side view of a pitcher produced on a forced sprout 

 showing venation as broken lines. The small number and the dis- 

 tribution of digestive glands are indicated. 



Figs. 8 and 9. — Lateral and front view of a pitcher on a forced shoot, 

 showing the spur is a flat structure, and the distribution of veins. 



Figs. 10-13. — Other pitchers produced on short shoots in which various 

 relations of the petiolar ' blade ' to the wings of the pitcher are noted. 



Fig. 14. — The digestive gland in N. Pervillei, covered by a deep pocket. 



Figs. 15-20. — Transverse section of the rim of several species. The arm 

 of the inner ridge bears a nectar gland. 



Fig. 15. — N. sp. aff. Balfouriana. 



Fig. 16. — N. venlricosa. 



Fig. 17. — N. gracilis. 



Fig. 18. — iV. Lowii. 



Fig. 19. — N. ampuUaria. 



Fig. 20. — -N. inermis Danser, "peristome almost none". A, transverse 

 section through peristome; B, looking into a nectar gland pit. 



Fig. 21. — Front and side view of the nectar gland in its pit, N. ampul- 

 lar ia. 



Fig. 22. — A^. intermedia, showing the two strongly developed groups of 

 peristome teeth at the base of the lid. 



Fig. 23. — N. bicalcarata, divided lengthwise, showing therefore only one 

 of the well developed, claw-like projections at the base of the lid. 



Fig. 24. — Transverse section through the lid and mouth of a very young 

 pitcher of N. anipidlaria. The glandular inner limb of the peristome is 

 seen to be an emergence from the inner surface of the pitcher wall. 



Fig. 25. — N. Tiveyi. Under surface of the lid, bearing a prominent me- 

 dian ridge with prominent processes. 



