313. Vorticella Folliculata.
V. oblonga, folliculo cylindraceo hyalino. Oblong vorticella, in a bright cylindrical bag.
This animalculum is gelatinous and cylindrical; when at its greatest extension, the base appears attenuated, and the apex truncated.
314. Vorticella Larva.
V. cylindrica, apertura lunata, spinis caudalibus binis. Cylindrical, the aperture somewhat in the shape of a crescent, two small thorny points projecting from the hinder-part.
The head, the trunk, and the tail, may be easily distinguished from each other. It is of a clay-colour, the aperture ciliated; with a globular projection at times appearing to proceed from it.
315. Vorticella Sacculata.
V. inverse conica, apertura lunata, trunco postice bidentato, cauda elongata biphylla. [Plate XXVII.] Fig. 42 and 43. This vorticella is in the shape of an inverted cone, with an aperture the figure of a crescent; the lower part of the trunk is notched, forming as it were two teeth; the tail biphyllous. Each of these parts is surrounded with a loose bright skin, the head is divided from the trunk by a deep incision. a a a, small points projecting from the head; b, the cilia; c and d d, the interior parts; Fig. 42, l, the little horn at the bottom of the trunk.
316. Vorticella Aurita.
V. cylindrico-ventrosa, apertura mutica, ciliis utrinque rotantibus cauda, articulata biphylla. Cylindrical and big-bellied, the aperture destitute of hairs, both sides of it are furnished with rotatory cilia, the tail biphyllous.