76 PHYLLOD'OCE LAMELLIGERA. 



1. Phyllodoce lamelligera, Gmelin sec. Pallas, 1788. Plate XLV; Plate XL VII, fig. 2; 

 Plate XLIX, figs. 1 and 2 variety; Plate LVIII, fig. 20— head; Plate LXVIII, 

 figs. i_3_f eet; Plate LXXVIII, fig. 6— bristle. 



Specific characters. — Head somewhat conical, bluntly rounded anteriorly, and cordate 

 at the base from two projecting processes. The ground colour is olive green, with a black 

 touch in front, and shows pinkish iridescence. Eyes two, large, placed about the middle. 

 Tentacles subulate and short ; tentacular cirri with a ringed basal region (ceratophore), 

 three pairs on the first segment and a rudimentary ventral cirrus on the second. 

 (De St. Joseph says : " First pair under the head on buccal segment ; second and third 

 pairs on the second segment ; fourth pair on third segment." Pruvot gives a 

 similar arrangement.) Both appendages have the same dull, greenish hue as the dorsal 

 cirri. A papilla or boss occurs at each side posteriorly. Body linear, much elongated 

 (14 — 18 in.), convex dorsally and flattened ventrally, tapered a little anteriorly 

 and more distinctly so posteriorly, where it ends in two rather stout caudal cirri. 

 Segments transversely ringed, shorter and broader anteriorly than posteriorly. The 

 cuticle is remarkably iridescent, and there is a median series of blackish specks, which, 

 with the dull greenish lamellae, make three touches in each segment. A conspicuous dark 

 belt on the upper and anterior edge of the pedicle of the foot. Ventral surface with 

 dusky pigment and three rows of specks, the median being pale. The proboscis in 

 extrusion is long, dark, and clavate, the basal section being covered with small papillae, 

 while the distal part has numerous low transverse papillae, and the terminal, firm disc has 

 about twenty-one papillae. The dorsal cirri anteriorly are reniform or ovate, at the 

 thirtieth elongate-ovoid, at the sixtieth foot the npper part is wide, so that the whole 

 process forms a broad flap. Posteriorly, they again diminish so as to resemble an acumi- 

 nate leaf. A ciliated ridge behind the dorsal border of the lamella. Setigerous process 

 somewhat clavate, Avith a bifid tip. Bristles pale, slightly curved at the distal end of the 

 shaft which has minute spines on the terminal ridges and over the surface. The terminal 

 blade is of moderate length, and has its edge boldly serrated and with striae sloping 

 dorsalward and backward. The ventral lamella is almost reniform in front, becomes 

 ovato-acuminate behind and longer than the setigerous region; anal cirri subulate. 



Proboscis with six rows of papillae at the base in extrusion, and sixteen to twenty-one 

 papillae at the opening into the stomach. 



Cerebral mass bilobate with a distinct ophthalmic lobe, and the oesophageal connectives 

 give off the stomato-gastric nerves. The ventral chain has more or less fused ganglia, 

 but the cords are distinct (Pruvot). 



Synonyms. 

 1767. Nereis maculata, Linnseus. Syst. Nat., ed. 12, i, pt. 2, p. 1086. 

 1788. „ lamellifera, Pallas. Nova Acta Petrop., ii, p. 232, tab. v, figs. 11 — 17. 

 1791. „ lamelligera, Grmelin. Linn. Syst. Nat., ed. 13, i, pt. 6, p. 3120. 

 1797. „ „ Shaw and Nodder. Naturalist's Miscell., ix, tab. 311 (fide aut.). 



1806. „ „ Turton. Linn. Syst. Nat., iv, p. 90. 



1807. „ „ idem. Brit. Fauna, p. 135. 



