L. subreniformis, ventricosa. Leucophra somewhat of a kidney shape, but ventricose.
168. Leucophra Fluxa.
L. sinuata reniformis. Reniform, sinuated leucophra.
169. Leucophra Armilla.
L. teres annularis. Round annular leucophra.
170. Leucophra Cornuta.
L. inverse conica, viridis opaca. [Plate XXV.] Fig. 42 and 43. An inverted cone, green, opake.
It bears some resemblance to the vorticella polymorpha, [No. 290], and the vorticella viridis, [No. 283], and requires to be observed for some time before its peculiar characters can be ascertained; the body is composed of molecular vesicles, of a dark green colour; for the most part it is like an inverted cone, the fore-part being wide and truncated, with a little prominent horn or hook on both sides; the hind-part conical, everywhere ciliated, the hairs exceedingly minute; those in the fore-part are three times longer than the latter, and move in a circular direction. The hinder-part is pellucid, and sometimes terminates in two or three obtuse pellucid projections. The animalculum will at one moment appear oval, at another reniform, and ciliated at the fore-part; but at another time the hairs are concealed. When the water evaporates, it breaks or dissolves into molecular vesicles. It is found late in the year in marshy grounds. Fig. 42, a, the hinder-part pointed; g, the cilia; h h, the sides. Fig. 43, b, the hinder-part obtuse; e, the fore-part; f, the horns.
171. Leucophra Heteroclita.
L. cylindrica, antice obtusa, postice organo cristato duplici exsertili. [Plate XXV.] Fig. 44 and 45. Cylindrical leucophra, the fore-part obtuse, the hind-part furnished with a double-tufted organ, which it can thrust in or out at pleasure. To the naked eye it appears like a white point; in the microscope, as a cylindrical body, the fore-part obtusely round, the middle rather drawn in, the lower-part round, but much smaller than the upper-part. With a large magnifying power the whole body is found to be ciliated. The intestines are very visible. It is represented in Fig. 44 as it generally appears; a, the fore-part; b, the hind-part; d, the hooked intestines; in Fig. 45, with the plumed organs; i i, the plumes; g g, the sheaths from which they are projected.