[Plate XXVII.] Fig. 46, 47, 48, 49, represent the wheel animals seen and delineated by Müller. a, the head; b, the eyes; c, a small horn; d, the rotatory organ; e, the tail; f, the points of the tail.
324. Vorticella Furcata.
V. cylindrica, apertura integra, cauda longiuscula bifida. Cylindrical vorticella, the aperture undivided, the tail rather long, and divided into two parts.
A cylindric body with a rotatory organ, consisting of a row of hairs at the apex; the tail is divided into two parts turning a little inwards. When at rest, it joins the segments of the tail; but opens them when in motion. It is generally found in common water.
325. Vorticella Catulus.
V. cylindracea, apertura mutica, cauda perbrevi, reflexa, bicuspi. [Plate XXVII.] Fig. 50. Cylindrical vorticella, the aperture plain, the tail short, bent back, and divided into two points.
It is a little thick muscular animalculum, folding itself up; of an equal breadth throughout, the body disfigured by longitudinal folds winding in various directions; the anterior part or head is connected to the body by a little neck, and it occasionally exhibits a very minute rotatory organ. The tail, e, is short, terminating in two very small bristles, d, which are exposed or concealed at pleasure; the intestines ill-defined. Its motion is rotatory, but in different directions. It is commonly found in marshy waters.
326. Vorticella Canicula.
V. cylindracea, apertura mutica, cauda brevi, articulata, bicuspi. Cylindrical vorticella, the aperture plain, with a short articulated tail divided into two pointed parts.