---- _Poli._ Test. utriusque Siciliæ, Pl. vi., fig. 16. 1795. POLLICIPES SCALPELLUM. _Lamarck._ An. sans Vertebres, 1818. POLYLEPAS VULGARE. _De Blainville._ Dict. Sc. Nat., Plate, fig. 4. 1824. SCALPELLUM LÆVE, var. _Leach._ Zoolog. Journal, vol. ii, p. 215, 1825. ---- SICILIÆ, var. _Chenu._ Illust. Conch. Pl. iv, fig. 9. SCALPELLUM VULGARE, (et var.) _Brown._ Illust. of Conch., 1844, Pl. li., figs. 7 to 20. _S. (Herm.) valvis 14, si rostrum pæne rudimentale includatur: lateribus superioribus inæqualiter ovatis._ (Herm.) Capitulum with 14 valves, including the rudimentary rostrum: upper latera irregularly oval. Mandibles, with four or five teeth: maxillæ, with the edge straight, bearing numerous spines. COMPLEMENTAL MALE flask-formed, with four rudimentary valves; no mouth; cirri not prehensile; attached to the occludent margin of the scutum, near the umbo. Great Britain, Ireland, France, Norway, Naples. Attached to horny corallines, at from twenty to thirty, sometimes even to fifty fathoms in depth, according to Forbes and MacAndrew. HERMAPHRODITE. _Description._--Capitulum much flattened with the apex produced, of a pale brown colour, sometimes faintly tinted purple, composed of 14 valves, of which the rostrum is rudimentary and barely visible externally; valves thin, white, translucent, smooth, slightly marked by the lines of growth, separated from each other by rather wide interspaces of colourless membrane, which is thickly clothed by small, articulated spines of unequal length. The valves, excepting sometimes their umbones, are also covered with membrane, bearing spines, placed in rows parallel to the lines of growth; the spines are particularly numerous round the orifice of the sack.