. Insectivorous plants. Carnivorous plants; Plants. Chap. XVU. STEDCTUEE OF THE BLADDEE. 399 the outside, six or seven long, pointed, multicellular bristles. These prolongations of the bladder may be conveniently called the antennae, for the whole bladder (^ee fig. 17) curiously resembles an entomostracan crus- tacean, the short footstalk representing the tail. In fig. 18,- the near antenna alone is shown. Beneath the two antennas the end of the bladder is slightly truncated, and here is situated the most important part of the whole structure, namely the entrance and valve. On each side of the
. Insectivorous plants. Carnivorous plants; Plants. Chap. XVU. STEDCTUEE OF THE BLADDEE. 399 the outside, six or seven long, pointed, multicellular bristles. These prolongations of the bladder may be conveniently called the antennae, for the whole bladder (^ee fig. 17) curiously resembles an entomostracan crus- tacean, the short footstalk representing the tail. In fig. 18,- the near antenna alone is shown. Beneath the two antennas the end of the bladder is slightly truncated, and here is situated the most important part of the whole structure, namely the entrance and valve. On each side of the entrance from three to rarely seven long, multicellular bristles project out-. Fm. 19. ( Utricu^na negkcta.) Valve of bladder; greatly enlarged. wards; but only those (four in number) on the near side are shown in the drawing. These bristles, to- gether with those borne by the antennse, form a sort of hollow cone surrounding the entrance. The valve slopes into the cavity of the bladder, or upwards in fig. 18. It is attached on all sides to the bladder, excepting by its posterior margin, or the lovrer one in fig. 19, which is free, and forms one side of the slit-like orifice leading into the bladder. This margin is sharp, thin, and smooth, and rests on the edge of a rim or collar, which dips deeply into the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Darwin, Charles, 1809-1882. New York : D. Appleton ;
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