Moiyliology of the Pitcher of the Ccphalotus follicularis. 175 



in line with the middle dorsal wing, and conspicuous by its 

 larger size, would represent the leaf-apex.* Of the two 

 possibilities I am disposed to look upon the first as the 

 more probable ; partly from the coincidence of the tip of 

 the middle dorsal keel or wing witli the leaf-apex in the 

 abnormal specimens mentioned above, and partly from the 

 vascular distribution in the normal pitcher. In the latter, 

 the vessels from the extremity of the petiole divide into 

 two sets, an upper going to supply the lid, and a lower 

 which diverge radiatingly and are distributed to the pitcher- 

 wall. Of the last mentioned set there are three somewhat 

 more marked than the others, viz., a lateral vein on either 

 side curving downwards and outwards past the lower 

 extremity of the lateral wing, and passing obliquely across 

 the lateral glandular patch to curve upwards towards the 

 pitcher orifice, and a middle vein which runs in the ventral 

 wall of the pitcher to the bottom, whence it passes on to 

 the dorsal surface, where, however, it leaves the pitcher- 

 wall, and, passing into the middle dorsal wing, continues 

 its course just within the curiously expanded edge of that 

 structure. In my opinion this course of the middle vein 

 seems to prove that the middle dorsal wing is a develop- 

 ment of the midrib, and that its apex really represents the 

 leaf-apex. 



In the three specimens exhibiting the funnel-shaped 

 excavation, it is to be observed that the sharp margin of 

 the far side of the orifice of the funnel — representing, as it 

 undoubtedly does, the margin of the leaf — is continuous 

 with an angular ridge, or lateral line, as we may call it, on 

 either side of the funnel (Plate V., figs. 3, 4, and 5, II). 

 These "lateral lines" can scarcely be anything else than 

 the downward continuations of the leaf-margin ; and if 

 they are so. it follows that all above the " lateral lines" is 

 upper, all below them loiver leaf-surface. In this way I 

 am led to view the pitcher-lid as wholly developed from 

 the upper leaf-surface, with which hoth its aspects are con- 

 tinuous. This conclusion might, indeed, have been antici- 

 pated from inspection of Specimen A, where the portion of 

 the margin of the spoon-like excavation next the petiole 



* Somewhat similarly, the teeth in line with the lateral wings of the pitcher 

 are also of conspicuous size. 



