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— Plate JO. — 



Figs. i-8. — Utricularia cornuta. 



Fig. 1. — The trap in lateral and frontal views. 



Fig. 2. — Entrance, with alluring glands below, from in front. 



Fig. 3. — Sagittal section of entrance. The door {di) is shown in the set 

 posture; d-i its open posture; dz normal relaxed posture and di, totally 

 relaxed posture, as when the trap is punctured; dt, direction of 

 thrust of lateral hinge; 0/, longitudinal thrust of door; c, compo- 

 nent of the two thrusts; dh, inner angle of threshold, as also in fig. 5. 



Fig. 4. — The door seen from in front. Inner course cells in double out- 

 line. Lettering as above. 



PiQ ^ — View of pavement from above as from point d, fig. 3; oz, mz, 

 iz, outer, middle and inner zones of pavement; de, position of door 



edge. 

 Fjg 6 _ Section through door and threshold taken as between c and d, 



FIG. 3; I, set, and 2 relaxed posture of door, approximately. 

 fjG 7. _ Section of same through d, fig. 3. Broken lines indicate opening 



flexures. 

 Fig. 8. — Section of same through c, fig. 3; mp, middle piece; /, rear 

 part of middle zone of pavement indicated in outline; d, dotted line 

 indicating the thrust of the door edge into the soft pavement cells 

 (arrows indicate the thrust of the lateral hinges). 



