128 CASTALIA FUSCA. 



1851. Psamathe fusca, Williams. Rep. Brit. Assoc, 1851, p. 213. 



,, „ „ Grube. Fam. Annel., pp. 58 and 130. 



1853. Nereis punctata (villosa), Daly ell. Pow. Creat., ii, p. 158. 



1862. Psamathe cirrhata, Keferstein. Zeitsch. f. w. Zool., Bd. XII, i, p. 107, Taf. ix, 



f. 32—36. 



1863. „ cirrata, Claparede. Beobacht., p. 55, pi. xiv, f. 1 — 7. 



1864. „ fusca, Grube. Insel Lussin, p. 82. 



„ ,, „ Kolliker. Kurz. Ber. Schott., p. 9. 



1865. Kefersteinia cirrata, De Quatrefages. Annel., ii, p. 41. 

 „ ,, Claparedii, Idem. Ibid., p. 42. 



„ Psamathe punctata (partim), Johnston. Cat. Brit. Mus., pp. 182 and 342. 

 ,, „ fusca, De Quatrefages. Annel., II, p. 101. 



1869. „ „ Mcintosh. Trans. R. S. Edin., xxv, pp. 412—413, pi. xvi, f. 2. 



1874. „ „ idem. Ann. Nat. Hist., ser. 4, vol. xiv, p. 197. 



1875. „ „ idem. Invert, and Fishes St. Andrews, p. 121. 

 1879. Castalia cirrata, Langerhans. Zeitsch. f. w. Zool., xxxiii, p. 306, f. 41. 



„ Psamathe „ Marion. Ann. Sc. Nat., 6 e ser., viii, art. 7, p. 21. 

 1885. Hesione fusca, Cams. Fauna Medit., p. 239. 



1890. Psamathe cirrata, G-iard. Bull. Sc. Fr. Belg., t. xxii, p. 78. 



1891. „ fusca, Hornel. Trans. Liverp. Biol. Soc, vol. v, p. 245. 

 1899. Kefersteinia cirrata, Mcintosh. Nat. Sc. (May), p. 376. 



1904. „ „ Allen. Journ. M.B.A., n.s., vol. vii, p. 220. 



1906. „ „ Bohn. Ann. Sc. Nat., 9 e ser., t. iii, p. 71. 



„ „ „ De St. Joseph. Ann. Sc. Nat., 9 e ser., t. iii, p. 228. 



Habitat. — Procured under stones between tide-marks at various points around the 

 British shores, and in Shetland in the roots of tangles in the laminarian region. It also 

 occurs in fissures of rocks — as many as thirty or forty having thus been obtained on 

 raising a large slab at Lochmaddy — where it is also found in the laminarian region. 

 Plymouth (Allen). 



St. Vaast, Normandy (Keferstein) ; Naples (Claparede). Mediterranean (Cams). 

 Marseilles (Marion). 



Head (Plate LVIII, fig. 15) small, square, entire in front, with two pairs of well- 

 marked black eyes, the pairs on each side being close together, the anterior elongated and 

 placed obliquely, and each furnished with a cuticular lens. Tentacles two ; palpi with 

 a massive basal segment, from which the terminal division comes off at an angle. It is 

 directed outward, and is comparatively short. The inner tentacles are slender, cylindrical, 

 tapered a little at the tip, and arise from the upper and inner base of the foregoing pair. 

 Tentacular cirri two pairs, filiform, slightly jointed and of great length, the dorsal being 

 the longer. 



Body from one inch to three inches long, scolopendriform, slightly narrowed in front 

 and tapered to a slender tail, which is terminated by two long slender cirri. 



Colour generally pinkish or fawn, yellowish-brown, or purplish-pink, darker in the 

 centre, and enlivened by the red dorsal blood-vessel, which makes a double curve behind 

 the oesophageal region. Cirri pale. Dr. Johnston considered that the purplish hue of some 

 specimens spreads rapidly over the body when the animal is alarmed. As this occurred 



