260. Kerona Rastellum.
K. orbicularis membranacea, nasuta, corniculis in tota pagina. Membranaceous, orbicular kerona, with one projecting point, the upper surface covered with small horns. There are three rows of horns on the back, which nearly occupy the whole of it. It was found in river water.
261. Kerona Lyncaster.
K. subquadrata, rostro obtuso, disco corniculis micantibus. This species of kerona is rather square, and its disc furnished with shining horns. See Zool. Dan. prod. add. p. 281.
262. Kerona Histrio.
K. oblonga, antice punctis mucronatis nigris, postice pinnulis longitudinalibus instructa. [Plate XXVII.] Fig. 20.
It is an oblong membrane, pellucid, with four or five black points in the fore-part, which are continually changing their situation, thick set with small globules in the middle, among which four larger ones are sometimes perceived, these are probably eggs; in the middle space of the hind-part are some longitudinal strokes resembling bristles, which, however, do not seem to project beyond the body. b, the horns; c, some hairs; d, a solitary horn; e, a large globule; f, some bristles.
263. Kerona Cypris.
K. obovata, versus postica superne sinuata, antice crinita. [Plate XXVII.] Fig. 21. Egg-shaped, towards the hind-part sinuated, the fore-part hairy.
This animalculum is compressed, and somewhat of a pear-shape; the fore-part broad and blunt; the front is furnished with short hairs or little vibrating points inserted under the edge a, shorter in the hind-part e, partly extended straight, and partly bent down, having a retrograde motion. It is found in water which is covered with lemna.