174 Professor Dickson on the 



specimen, is here developed in the middle line into a small 

 but distinct tooth-like projection. This lobe is the first 

 indication of the pitcher-lid. As in the former specimen, 

 there is here, also, a keel-like ridge in the middle line on 

 the lower leaf-surface. 



Specimen (Plate V., fig. 4). — In this we have a still 

 greater approximation to the pitcher-form. As in the last, 

 we have a funnel-like structure witli oblique mouth, the far 

 side of which retains, however, more of the original pointed 

 form of the leaf-apex. The greater advance towards the 

 ascidium consists in the greater development of the 

 structure representing the pitcher-lid, which is of con- 

 siderable size and deeply cut into three lobes, two longer 

 and stronger lateral lobes, and a shorter, feebler median 

 one. Here, again, we have along the middle dorsal line a 

 keel-like projection. 



Specimen D (Plate V., figs. 5 and 6). — In this, a mis- 

 thriven leaf of very small size, we have a still greater 

 approximation to the normal ascidium. The lid is 

 relatively larger, and exhibits two lobes separated by a 

 considerable notch, in this respect according more with the 

 structure of the normal lid, where we have the extremity 

 emarginate, corresponding to the dichotomous disposition of 

 the principal veins. Further, in addition to the middle 

 dorsal keel or wing, which is more pronounced in this than 

 in the other specimens, we have, on one side, a slight in- 

 dication (Plate v., figs. 5 and 6, ho) of one of the oblique 

 lateral wings of the normal pitcher. The far side of the 

 orifice of the funnel has still the pointed form of the apex 

 of the foliage-leaf. 



In all these specimens it is to be noted that the tip of 

 the middle dorsal keel or wing and the apex of the leaf are 

 coincident. Inasmuch, however, as none of them show the 

 slightest trace of the remarkable development of the corru- 

 gated rim, with its inflexed teeth, it may still be open to 

 question what represents the leaf-margin in the perfect 

 pitcher. If the lower (outer) border of the corrugated rim 

 represents the leaf-margin, then the tip of the middle dorsal 

 wing would represent the leaf-apex. If, on the other hand, 

 the leaf-margin is represented by the line of the inflexed 

 teeth, then the middle dorsal tooth (Plate V., fig. 6, mcU), 



