V. simplex, hemisphærica, pedunculo retortili. [Plate XXVII.] Fig. 54. Simple, hemispherical, with a twisted pedicle.
The small head of this animalculum is goblet-shaped, the margin of the orifice protuberant, ciliated on both sides, with undulating hairs; the pedicle eight or ten times the length of the body. The pedicle extends itself as often as the mouth is opened, but is twisted up spirally when it is shut; and these motions are frequently repeated in a short space of time, a a, the head when expanded; b, when shut; c, the undulated edge; d d, the cilia erect; e, when horizontal; f, the pedicle when straight; g, when bent in a spiral form.
342. Vorticella Convallaria.
V. simplex, campanulata, pedunculo retortili. This animalculum, the bell-animal of Baker, has been fully described in [page 407].
343. Vorticella Nutans.
V. simplex, turbinata, pedunculo retortili. Simple, with a twisted turbinated pedicle.
The pedicle is simple, and twists itself spirally; is extremely slender, with a kind of cap on its head; the margin white and round, and appearing as if encompassed with a lucid ring; the head diminishes towards the base. It is transparent.
344. Vorticella Nebulifera.
V. simplex, ovata, pedunculo reflexili. [Plate XXVII.] Fig. 66. Simple, egg-shaped, the pedicle bent back.
The body is narrow at the base, open and truncated at the top; the margin apparently surrounded with a ring; but, when the aperture is shut, the animalculum is egg-shaped, with a simple setaceous pedicle, considerably longer than the body, and generally much bent back. a a a, the head open; b, partly closed; c, quite shut; d, the stalk when straight; and at e, when bent.