— Plate iS.— 



Figs. i-i8. — Dionaea muscipida. 



Fig. I. — Inner surface of a trap lobe, showing the distribution of veins, 

 of the digestive glands and, along the scalloped margin, the alluring 

 glands. The three trigger hairs are seen. 



Fig. 2. — A trigger hair from a fully developed large leaf. 



Fig. 3. — A trigger hair from a minute seedling leaf. 



Fig. 4. — a, diagram to indicate postures of the trap lobes in (/) open, 

 (2) closed and (j) "narrowed" states (after Ashida); b, trap nar- 

 rowed to the extreme. 



Fig. 5. — Section of the upper epidermis and adjacent parenchyma of a 

 mature large trap. 



Fig. 6. — Lower epidermis of same. 



Fig. 7. — Young leaf: growth movement involved in the unfolding of the 

 trap. 



Fig. 8. — A trap about 2 mm. long showing the twisted stalk and the 

 symmetry of the cilia. 



Fig. 9. — Upper surface of the left lobe of a trap 2 mm. long, taken from 

 a seedling. 



Fig. 10. — Sections of a mature leaf, drawn to scale, to show the relative 

 sizes of the epidermal and parenchyma cells. 



Fig. II. — A stellate hair from exterior surface of trap (and elsewhere). 



Fig. 12. — A digestive gland. The section on the left is cut trans- 

 versely to the leaf lobe. At right, apical view of gland. 



Fig. 13. — Base of digestive gland, the section cut at right angles to 

 that of FIG. 12. 



Fig. 14. — xAlluring gland in section. 



Fig. 15. — Longitudinal section through base of trigger hair to show the 

 sensitive cells (arrow point). 



Fig. 16. — Transverse section through the sensitive cells of trigger hair. 



Fig. 17. — Transverse section of lobe of a minute (2 mm. long) trap. 



Fig. 18. — Longitudinal section of same. 



