2 



PITCHER OF CEPHALOTUS FOLLICULARIS. 



number of inflexed teeth (Fig. 1, it), almost exactly as is seen 

 in some species of Xepenthes. This corrugated rim is deficient 

 along the line of the base of the lid. Within or below the corru- 

 gated rim is a remarkable ledge or shelf extending all round the 

 inside of the pitcher, its free and rather sharp edge projecting 

 downwards into the cavity, and forming as it were an inner orifice : 

 from its jn-obable function, this may be called the conducting shelf 

 (Fig. 1, c.b). Below this the upper two-thirds or three-fourths 

 of the inner surface (Fig. 1, ngs) is smooth, glassy, and studded 

 over with glands which no doubt secrete a digestive fluid. At 

 the lower limit of this secreting surface on either side of the 

 pitcher is to be noted a very oblique, somewhat curved linear 

 elevation of the surface ; to the naked eye, of a dull reddish 

 brown colour, or almost of a neutral tint (Fig. 1, Ip). These 

 coloured elevations exhibit a very remarkable glandular structure, 

 and may be designated the lateral coloured jmtches. Below these 

 patches the inner surface of the bottom of the pitcher is smooth 

 and eglandular (Fig. 1, ds). 



As regards structural details, these may be considered under 

 the following heads : — 



A. Outer Surface of Pitcher and Lid. — Here occur stomata of 

 ordinary type, and peculiar glands, each consisting of a group of 

 small cells. Each group, as viewed from the surface, is of oval 

 form, two cells forming a central oval, with then- line of contact 

 across the short diameter, these two cells being surrounded by 

 four others. Similar six- celled glands are also to be found on 

 the inner surface of the pitcher-lid, on the corrugated rim of the 

 pitcher, and on both surfaces of the non-ascidiform leaves. The 

 most remarkable structures, however, connected with the outside 

 of the pitcher are the pale brown hairs already noted. Each of 

 these is an elongated cell with pointed extremity and a broad 

 truncated base imbedded in a slightly elevated group of epidermis 

 cells. This unicellular lian is solid from the tip to within a half 

 or a third of the distance from the base. The cell cavity thus 

 reduced is bounded by a distinct and highly refractive wall, and 

 the appcara)icc is thus presented of one hair encapsulated within 

 another. According to the modern view of cell-thickening by 

 interstitial intus-susception, this would be a remarkable case of 

 the differentiation of the thickened cell-wall into two layers of 

 difterent character. These hairs are minutely tuberculated on 

 the outer surface. 



B. Inner Surface of Pitcher-lid. — Here the epidermis-cells are 

 somewhat imbricated from above downwards, and their free walls 

 form slight downward bulgings. The free surfaces of these cells 

 exhibit beautiful ridge-like striae ; and the surface ridging is so 

 arranged as to form little transverse arches between adjacent 

 cells, with concavities directed downwards. These arches, no 

 doubt, constitute obstructive ledges which would oppose the 

 upward passage of an insect. The small glands, already mentioned, 

 which are scattered over this surface might have been supposed 

 to secrete honey for the attraction of insects ; but this may be 



