400 UTRICULARIA NEGLECTA. Cuar. XVIL 
bladder, as shown in the longitudinal section (fig. 20) 
of the collar and valve; it is also shown at ¢, in fig. 18. 
The edge of the valve can thus open only inwards. 
As both the valve and collar dip into the bladder, a 
hollow or depression is here formed, at the base of 
which lies the slit-like orifice. 
The valve is colourless, highly transparent, flexible 
and elastic. It is convex in a transverse direction, 
but has been drawn (fig. 19) in a flattened state, by 
which its apparent breadth is increased. It is formed, 
Fie. 20. 
(Utricularia neglecta.) 
Longitudinal vertical section through the ventral portion of a bladder; showing valve 
and collar. v, valve; the whole projection above ¢ forms the collar; b, bifid pro- 
cesses ; 8, ventral surface of bladder. 
according to Cohn, of two layers of small cells, which 
are continuous with the two layers of larger cells 
forming the walls of the bladder, of which it is evi- 
dently a prolongation. Two pairs of transparent 
pointed bristles, about as long as the valve itself, 
arise from near the free’ posterior margin (fig. 18), 
and point obliquely outwards in the direction of the 
antenne. There are also on the surface of the valve 
numerous glands, as [ will call them; for they have 
the power of absorption, though I doubt whether 
they eyer secrete, They consist of three kinds, which 
