FAM. 4. _Phyllodocidae._—The members of this family make use of the foliaceous cirri (Fig. 136, F) in their very active movements. The rounded prostomium bears four or five tentacles; there are four long peristomial cirri on each side (see Fig. 134, E). Sub-Fam. 1. _Phyllodocina._—The body is elongated, with numerous segments; the eyes are small; the chaetae are jointed; the dorsal and ventral cirri are foliaceous; the pharynx is covered with papillae externally, but contains no "jaws." _Phyllodoce_ has a more or less depressed body; four prostomial tentacles; four pairs of peristomial cirri. _P. lamelligera_ Jnstn.[375] (the "paddle-worm") may reach a length of 24 inches, but is usually 8 to 12 inches long and ½ inch across. The general colour is bright bluish-green or yellowish-green, with metallic iridescence; the parapodia olive-green or brown, the sensory {314}processes yellow. It lurks, during day, under stones and shells, etc., in the Laminarian zone. The green egg masses, so frequently referred to as belonging to _Arenicola_, are laid by Phyllodocids.[376] [Illustration: FIG. 165.—_Phyllodoce paretti_ Blv. × ½. (From _Règne Animal_.)] In _Eulalia_ an additional (fifth) tentacle arises from the middle of the back of the prostomium. _E. viridis_ Müll. is a dark green worm smaller than the preceding; common between tide-marks, hiding in cavities and tunnels in limestone rocks, which have been bored by the mollusc _Saxicava_; it is rare where such rocks are absent. It might have been thought that its vivid colour would harmonise with its surroundings, but it is most abundant in regions where _Fucus_ abounds and _Ulva_ is absent. It is evident then that the colour is not protective; it may perhaps be of warning significance, for the mucus secreted in quantities by glands on the cirri of the Phyllodocids is probably objectionable to their enemies. _Phalacrophorus_ Grf. and _Pontodora_ Grf. may be mentioned as pelagic genera. Sub-Fam. 2. _Lopadorhynchina._—This includes small forms, _Lopadorhynchus_ Gr., _Pelagobia_ Grf., and other pelagic genera. [Illustration: FIG. 166.—_Nauphanta celox_ R. Grf. × 4. (From Greef.) _e_, The large eye.] Sub-Fam. 3. _Alciopina._—These are surface forms, and, like most pelagic animals, are colourless and transparent; the eyes, however, are very large, and, with certain brown spots in each segment,[377] are the only coloured parts in the body; in structure the eyes are much more complicated than {315}those of other Polychaetes. The prostomium has five tentacles; there are long peristomial cirri, and in general their anatomy agrees most closely with that of Phyllodocids. _Alciope_, _Asterope_, _Vanadis_, _Nauphanta_ are genera of the family;[378] none have been recorded from the British area.