It agrees in many respects with the trichoda pulex, [No. 252]; but the upper part is pellucid, without any black molecules; the front truncated, the whole surface of the head covered with hair, and the fore-part sinuous. a, the horns; b, the hairs at the hinder-part; c, the cilia of the front.
269. Kerona Mytillus.
K. subclavata, utraque extremitate latiori, hyalina ciliata. [Plate XXVII.] Fig. 29. Rather clubbed, broad at both extremities, clear and ciliated.
A large animalculum, the fore and hind-part rounded, very pellucid and white, dark in the middle, with black intestines, intermixed with a few pellucid vesicles; both extremities appear as if composed of two thin plates. The fore-part is ciliated, the hairs short, lying within the margin; it is also ornamented with two small horns, erected from an obscure mass; with these it agitates the water, forming a little whirlpool. The hind-part is likewise ciliated, and furnished with two bristles, extending beyond the margin. a, the horns; b, the fore-part ciliated; c, the hind-part; d, projecting bristles.
270. Kerona Lepus.
K. ovata, apice crinito, basi setosa. Egg-shaped, the fore-part hairy, the base furnished with bristles.
The body is egg-shaped, compressed, pellucid, and crowned with short waving hairs, the base terminating with bristles.
271. Kerona Silurus.
K. oblonga, antice et postice crinita, dorso ciliato. Oblong, the fore and hind-part hairy, the back ciliated.
An oval smooth animalculum, somewhat crooked and opake, with a fascicle of vibrating hair on the fore-part; it has a sharp tail, furnished with unequal rows of moveable hairs, producing a rotatory motion; in the inside are some partly lucid, and partly opake points. The figure varies from oval to oblong, the filaments of the conferva are often entangled in the tail.