Characterized by curving branches leaning forward in the direction of movement, and other long curving streamers lagging behind and below. Fluffy parts are usually present, and mark the origins of the long curling fibres. Ci. V. 5. _Cirrus nebulosus_ (Plate 9). Hazy cirrus. Characterized by the absence of sharply defined lines, fibres, or streamers; all parts of the cloud being hazy, and suggestive of other varieties of cirrus out of focus. Ci. Neb. 6. _Cirrus caudatus_ (Plate 8). Tailed cirrus. Characterized by small hazy or fluffy heads behind or below which hang long streamers, which taper away more or less to a point. The tails are sharply defined, and so are the edges of the heads. Ci. Ca. 7. _Cirrus vittatus_ (Plates 12 and 13). Ribbon cirrus. Characterized by formation in long bands of cloud, sometimes made of parallel long fibres with cirrus haze linking them together, sometimes consisting of a long bundle of fibres, from which others diverge at an angle as shown in the plate. Ci. Vt. 8. _Cirrus inconstans_ (Plate 10). Change cirrus. Characterized by a peculiar ragged, wavy appearance. It is generally only the beginning or the end of a mass of cirro-stratus or cirro-cumulus, but occasionally it vanishes shortly after its appearance, without reaching the further stage. Ci. In. 9. _Cirrus communis_ (Plate 11). Type cirrus or common cirrus. Characterized by short irregularly curling fibres collected together in considerable patches. No definite arrangement into any of the forms already described. Ci. Com. GROUP CIRRO-STRATUS. Under this group the cloud usually shows some structure, being apparently built up from a massing together of detached forms at a common level. When this is so it should be described by adding the specific name of the detached form most nearly related. 1. _Cirro-stratus nebulosus_ (Plates 3, 4, and 14). Hazy cirro-stratus. Characterized by absence of visible structure. Ci. S. Neb. 2. _Cirro-stratus communis_ (Plate 16). Common cirro-stratus. Characterized by the presence of short curling fibres matted together. Ci. S. Com. 3. _Cirro-stratus vittatus_ (Plate 57). Ribboned cirro-stratus. Characterized by being made up of long stripes or bands of cloud. Ci. S. Vt. 4. _Cirro-stratus cumulosus_ (Plate 17). Flocculent cirro-stratus. Characterized by an obscurely granular structure. Ci. S. Cu. Many forms of cirro-stratus are arranged in waves or ripples. This is indicated by attaching the word undatus, or waved, after the ordinary specific name, or the letter U after the abbreviation. GROUP CIRRO-CUMULUS. Divisible into three species. 1. _Cirro-macula_ (Ley) (Plate 23). Speckle cloud. Characterized by semi-transparency, by the fact that the particles are frequently whiter and more opaque on their edges. A patch of cirro-macula always looks like a thin sheet which has curdled. Ci. Ma. 2. _Cirro-cumulus nebulosus_ (Plates 20 and 21). Hazy cirro-cumulus.