A full description of this vorticella has also been given at [page 397].
353. Vorticella Digitalis.
At [page 406] the reader will likewise meet with an account of the v. digitalis.
354. Vorticella Polypina.
V. composita, ovato-truncata, pedunculo reflexili ramosissimo. [Plate XXVII.] Fig. 61. Compound vorticella, oval, truncated, with a bending branching stalk.
When viewed with a small magnifier, they appear like so many little trees; the upper part or heads are egg-shaped, the top truncated, the lower part filled with intestines; the branches are thick set with little knobs. a, the trunk; b b b, the branches; c c, the head when extended; d, the small knobs on the branches.
355. Vorticella Racemosa.
V. composita, pedunculo rigido, pedicellis ramosissimis longis. Compound, rigid pedicle, with small branched long feet.
To the naked eye it appears like the vorticella socialis, described in [page 395], but is distinguished from it by always adhering to the sides of the vessel in which it is placed. With the microscope, a long very slender pedicle is discovered sticking to the sides of the vessels, from which proceed an innumerable quantity of crystalline pellucid pearls, which, together with the stalk, are variously agitated in the water. They sometimes move separately, at other times together, are sometimes drawn down to the root, and in a moment expanded again.