16 2 PIONOSYLLIS PROLIFERA. 



1879. Typosyllis (Syllis) prolifera, Laiigerhans. Zeitscli. f. w. Zool., Bd. xxxii, p. 530, Taf. xxxi, f. 3. 



1885. Syllis prolifera, Carus. Fauna Medit., II, p. 226. 



1886. „ {Typosyllis) prolifera, De St. Joseph. Ann. Sc. Nat., 7 e ser., torn, i, p. 147, pi. via, 



f. 9—13. 

 1900. „ variegata, G-ravier. Xouv. Arch. Mus., 4 e ser., Taf. ii, p. 158, pi. ix, f. 8. 



1903. „ prolifera, Mcintosh. Mar. Invert. S. Africa, vol. iii, p. 35. 



1904. Typosyllis prolifera, Allen. Journ. M. B. A., n. s., vol. vii, p. 219. 



1905. Syllis „ (= lussinensis, fiumensis, and Armandi, Clap.), Grraeffe. Arbeit. Zool. 



Stat. Triest, xv, p. 323. 

 f 1906. „ {Typosyllis) prolifera, De St. Joseph. Ann. Sc. Nat., 9 e ser., t. iii, p. 179. 



Habitat. — Abundant in fissures and cracks of the rocks to the north of the harbour 

 St. Peter Port, Guernsey ; between tide-marks at Luccomb Chine, Isle of Wight, and in 

 the same region at Herm ; between tide-marks, Outer Hebrides ; seven to eight fathoms 

 in the West Voe of Burra, Scalloway. 



Adriatic, Mediterranean, shores of France, Madeira, whilst Malmgren procured his 

 species from Spitzbergen ; South Africa. The range thus is wide. 



Head (Plate LIX, fig. 10) of the typical shape, with long palpi. Median tentacle 

 has twenty-five to thirty articulations ; lateral somewhat shorter. 



M 



Fig. 53. — Plan of dorsal markings of Pionosyllis prolifera. 



Body of a dull straw-colour, banded with brown in front. On each side of the 

 segment-junction is a short, brown bar (fig. 53), in each lateral region with a speck or 

 brown touch in front; whilst, in the median line, a shorter bar occurs at a greater 

 distance from the segment-junction. Occasionally the general hue of the anterior region 

 is greenish-olive. It is rather pale posteriorly. The markings thus approach those 

 observed in other forms, such as the Pionosyllis lamelligera of De St. Joseph, a species, 

 however, in which the tentacles and cirri are not articulated. In some from Shetland 

 the body is roseate anteriorly, with a black speck (which remains for some time in spirit) 

 at the base of each dorsal cirrus. 



The foot (Plate LXX, figs. 4—6) has a long and distinctly articulated cirrus which 

 tapers clistally and has about twenty-seven articulations. The setigerous lobe is bluntly 

 conical with a receding slope ventrally. The spines, which have a peculiar and short 

 point, pierce the lobe at the upper angle. The bristles (Plate LXXVIII, figs. 14 and 15) 

 are translucent and of moderate or small size, and have the convexity of the enlarged 

 region at the end of the shaft denticulated. The terminal piece is rather long, has a 

 nearly straight spinous edge, and is minutely bidentate at the tip. 



The ventral lobe is somewhat lanceolate, diminishing at base and tip. It does not 

 extend so far as the end of the setigerous region. 



Reproduction. — Several examples had buds, and in one this was of larger diameter 

 than the nurse-stock, and of a fine salmon-tint, apparently from the ova. It was about 

 a third the length of the adult, and often contorted itself in opposition to it. It had four 



