Cuar. XVIIL STRUCTURE OF THE BLADDERS. 433 
just enter the bases of the bladders; but they do not 
bifurcate and extend up the dorsal and ventral sur- 
faces, as in the previous species. 
The antennz are of moderate length, and taper to a 
fine point ; they differ conspicuously from those before 
described, in not being armed with bristles. Their 
bases are so abruptly curved that their tips generally 
rest one on each side of the middle of the bladder, but 
Fig, 27. 
(Utricularia montana.) 
Bladder; about 27 times enlarged. 
sometimes near the margin. Their curved bases thus 
form a roof over the cavity in which the valve lies; 
but there is always left on each side a little circular 
passage into the cavity, as may be seen in the drawing, 
as well as a narrow passage between the bases of the 
two antenne. As the bladders are subterranean, had 
it not been for the roof, the cavity in which the valve 
lies would have been liable to be blocked up with earth 
