MYRIANIDA PINNIGBRA. 229 



1. Myeianida pinnigera, Montagu, 1808. Plate LXXI, figs. 5 and 6— feet; Plate LXXIX, 



figs. 24 and 24 a — bristles. 



Specific Characters. — Head comparatively small, bluntly conical or irregularly 

 rounded. Eyes large, the two anterior being wide apart, while the pairs on each side are 

 close together. Palpi apparently fused, forming two rounded bosses with a median 

 fissure in front. Median tentacle long and somewhat clavate, lateral shorter and dilated 

 at the tip. First pair of tentacular cirri curved and short; second clavate and rather 

 longer. Body (of nurse-stock and buds) about 1^ in. long, the two sections being nearly 

 equal. Nurse-stock dull whitish and brilliantly marked by thirteen rich orange spots, 

 two irregular longitudinal patches in front, followed by a pair, and then nine well- 

 defined spots, having a deep orange marginal belt and a paler orange centre. Two 

 orange dots occur on the last segment of the nurse-stock. Behind the tentacular cirri 

 are two or three cirri of similar form, though with a tendency to flattening, but becoming 

 ringed in spirit, and thus differentiated from the succeeding. Foot with the dorsal 

 cirrus in the form of a flattened oar, which is translucent, with a faint milky opacity, and 

 of a tissue more lax than the ceratophore. Setigerous lobe has superiorly a prominent 

 papilla above the spines, whilst the outline of the ventral border is nearly semi- circular. 

 Bristles rather feeble, elongated, the distal end of the shaft dilated, and the bevelled 

 region spinous distally. Terminal piece short and diminished towards the bifid tip. 



Synonyms. 



1808. Nereis pinnigera, Montagu. Trans. Linn. Soc, ix, p. Ill, Tab. 6, f. 3 (nurse-stock and bud). 



1812. „ „ Pennant. Brit. Zool., iv, p. 95. 



1815. „ maculosa, Montagu. Trans. Linn. Soc, xi, p. 21, pi. iii, f . 4 ( $> bud). 



1845. Myrianida fasciata, M. Edwards. Ann. Sc. Nat., 3 e ser., t. hi, p. 170, pi. xi, f. 65 — 68. 



1851. Nereis pinnigera, Grrube. Fam. Annel., p. 63. 



1864. „ „ Kolliker. Kurz. Ber. Scliotl., p. 9. 



1865. Nereis pinnig era, Johnston. Cat. Buit. Mus., p. 281. 

 „ „ maculosa, idem. Ibid, pp. 198, 280 (bud). 



„ Myrianida fasciata, De Quatrefages. Annel., II, p. 63. 



„ „ pinnigera, Johnston. Cat. Brit. Mus., p. 196. 



1867. „ „ Parfitt. Trans. Devon. Assoc., ii, pt. i, p. 236. 



„ Amytidea maculosa, idem. Ibid., p. 29. 



1869. Myrianida fasciata, Langerhans. Zeitsch. f. w. Zool., xxxii, p. 581. 



1885. „ „ et maculata, Carus. Fauna Medit., p. 237. 



1886. „ ,. Viguier. Arch. Zool. Exper., 2 e ser., iv, p. 432, pi. xxvii, f. 21 and 22. 

 „ „ „ Harvey Gibson. Proc. Lit. Phil. Soc. Liverp., vol. xi, p. 154. 



1890. „ pinnigera, Griard. Bull. Sc. Fr. Belg\, t. xxii, p. 79. 



1893. ,, fasciata, Malaquin. Recherch. Syllidiens, ubique in text and figs. 



1895. „ maculata, De St. Joseph. Ann. Sc. Nat., 7 e ser., torn, xx, p. 195. 



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



Habitat. — Dredged in 10 fathoms at the northern end of Bressay Sound, amongst 

 horse-mussels, July, 1871 ; and, again, in the Sound of Harris, in 3 to 4 fathoms, in 



