398 UTRICULARIA NEGLECTA. Cuar. XVIL 
The bladders are filled with water. They generally, 
but by no means always, contain bubbles of air. Ac- 
cording to the quantity of the contained water and 
air, they vary much in thickness, but are always some- 
what compressed. At an early stage of growth, the 
flat or ventral surface faces the axis or stem; but the 
footstalks must have some power of movement; for 
in plants kept in my greenhouse the ventral surface 
was generally turned either straight or obliquely 
downwards. The Rev. H. M. Wilkinson examined 
Fig. 18, 
(Utricularia neglecta.) 
Bladder; much enlarged. c, collar indistinctly seen through the walls. 
plants for me in a state of nature, and found this 
commonly to be the case, but the younger bladders 
often had their valves turned upwards. 
The general appearance of a bladder viewed late- 
rally. with the appendages on the near side alone 
represcnted, is shown in the accompanying figure 
(fig. 18). The lower side, where the footstalk arises, is 
nearly straight, and I have called it the ventral surface. 
The other or dorsal surface is convex, and terminates 
in two long prolongations, formed of several rows of 
cells, contsining chlorophyll, and bearing, chiefly on 
