Another form, also common, especially in clear water, is _Synchæta_ (Fig. 8), very much like a kite or peg-top in shape, which has the power of attaching itself by a glutinous thread, and spinning round at a tremendous rate. Then there is the gigantic _Asplanchna_ (Fig. 9), which has no opening below, so that the waste must be discharged by the mouth; and curious _Sacculus_, which gorges itself with chlorophyll until it looks like a green bag with a string round it, but clear and sparkling. Of the _Notommatæ_ there is a whole host, but we can only mention the beautiful _N. Aurita_ (Fig. 10), with an eye of a beautiful violet colour, composed of several spherules massed together, and two curious ear-like processes on the head, from which it takes its name. Some of the Ploïma have powers of leaping which must be noticed. The _Triarthra_ (Fig. 11) has three arms, or what we may call such, which it can stretch out suddenly and leap to a considerable distance, whilst in _Polyarthra_ the arms become a whole cluster of broad saw-like bristles. We pass on to note a few species of the mail-clad or loricated Rotifers, chief among which the great _Euchlanis_ (Fig. 12), a noble-looking fellow, calls for our attention, his great size rendering him easily visible to the naked eye. It is difficult to avoid using the masculine gender, but, of course, all those figured and described are of the gentler sex. _Salpina_, too (Fig. 14), with its box-like lorica, armed with spines at each of the upper angles, and having three below, is quite easily recognised, and very common. _Brachionus_ (Fig. 13) has a shield-shaped case, well furnished with spines, symmetrically arranged at the top, and an opening below for the flexible wrinkled tail, like the trunk of an elephant. _Pterodina_ (Fig. 15) has a similar tail, but a round case, and the head is much more like that of the common Rotifer when extended. _Anuræa_ (Fig. 16), on the other hand, has no tail, and its case is shaped like a butcher’s tray, with a handle at each corner. _Dinocharis_ (Fig. 17) has a roof-like case, with long spines on the root of the tail, and a forked stiff foot. _Noteus_ (Fig. 18) is much like Pterodina, except in its foot, which more nearly resembles that of Dinocharis. The list might be indefinitely extended, but sufficient has probably been said to enable the tyro to find his bearings in this large, beautiful, and interesting class.