212 AUTOLYTUS PICTTJS. 



Synonyms. 



1864. Stephanosyllis scapidaris, Claparede. Glanures, p. 107, pi. vii, f. 5. 

 ,, Procersea picta, Ehlers. Borstenw., I, p. 256. 



1865. Myranida ,, De Quatrefages. Annel., II, p. 63. 



1868. Procersea „ Claparede. Annel Nap., p. 219. 



1869. Autolytus pictus, Mcintosh. Trans. R. S. Edin., t. xxv, p. 415, pi. xv, f. 11. 



1874. Autolytus (Procersea) pictus, Mcintosh. Ann. Nat. Hist., ser. 4, vol. xiv, p. 198. 



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



1879. Procersea picta, Langerhans. Zeitsch. f. w. Zool., Bd. xxxii, p. 577, pi. xxxii, f. 28. 



1885. „ „ Carus. Fauna Medit., p. 235. 



1887. Autolytus (Procersea) pictus, De St. Joseph. Ann. S.c. Nat., 7 e ser., t. i, p. 222, pi. xi, 



f. 100—105. 

 1890. „ „ „ Malaquin. Annel. Boulonn., p. 39. 



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



1906. „ „ „ De St. Joseph. Ann. Sc. Nat. 9 e ser., t. iii, p. 186. 



Habitat. — Under stones in rock-pools and near low water, St. Andrews ; under a stone 

 in a rock-pool at Paible, North Uist ; on a zoophyte off Sark (Mrs. Collings) ; Plymouth 

 (Allen). It is probably very widely distributed in Britain, and is not uncommon at St. 

 Andrews, where it was first found by my sister, who made the coloured drawings. 



Abroad it occurs in the Mediterranean (Carus) and the White Sea; the Adriatic 

 (Ehlers); Cannes (De St. Joseph); Madeira (Langerhans). 



Head somewhat small, rounded in front, the longer diameter being antero-posterior. 

 Byes two on each side, the anterior pair the wider apart, but sometimes they are connate, 

 both the anterior and posterior being furnished with lenses, the former, like the eye, being 

 the larger, and De St. Joseph states that they lie in front, while the lenses of the posterior 

 are behind. Two lateral and a longer and thicker median tentacle, all of a deep madder- 

 brown colour, the median being darkest, though its ceratophore is paler. Their surface is 

 supplied with numerous palpocils. The ocular region is richly ciliated, and the dark por- 

 tion (probably De St. Joseph's fused epaulettes), at the sides of the succeeding ring, is 

 also ciliated. A dark patch of deep brown is placed behind the median tentacle, and 

 from the latter two diverging pale lines proceed backward. The tentacular cirri are 

 less elongated than the tentacles, but have the same madder-brown colour. 



Body about an inch in length, and with upwards of 100 segments, slightly narrowed 

 anteriorly, and more distinctly so posteriorly, where it terminates in two short, flattened, 

 and curved cirri — ■ about twice the length of the last segment. The dorsum is prettily marked 

 by a pale central band with numerous and regular transverse spurs which cut the sepia- 

 brown pigment into oblong spaces. The spaces, however, are not solidly pigmented, but 

 are striated by fine pale lines and grains (under a lens). By transmitted light some of the 

 dark pigment appeared of a fine purplish hue. On each side below (and external to) these 

 striated oblongs is a pale lateral band, into which the transverse spurs run. Just above 

 the feet a dark brown belt passes from end to end, intersected here and there — opposite 

 the pale transverse spurs — by narrow pale lines. The first twelve or thirteen segments 

 are darker and the ground-colour is paler than in the rest. The lateral pale line within 

 the feet is also less distinct in this region, but behind it becomes boldly marked though 



