MAGELONA PAPILLICORNIS. 223 



1. Magelona pap[llicornis 5 Fritz Midler, 1858. Plate XC, fig. 6; Plate XCIII, figs. 4 

 and 5— young; Plate XCIV, fig. 17 — young; Plate CI, figs. 2— 2 c — anterior 

 region and feet; Plate CVI, figs. 7— 7 h— bristles and hooks. 



Specific Characters. — Head (prostomium) a large, flattened and somewhat ovoid 

 muscular plate marked marginally by anastomosing vessels and forming a roof to the 

 peris tomial segment beneath it. Mouth opens ventrally, and the proboscis can be 

 extruded as a mushroom-shaped organ. Tentacles long, with large papillse on the distal 

 two-thirds, and non-caducous. Touches of dark pigment occur as bars on them. Body 

 6—7 inches in length, apparently of two well-marked regions, the anterior short, of eight 

 segments, and the posterior of more than a hundred, but the peculiar ninth segment 

 really indicates a third region. It is somewhat quadrangular in section throughout. 

 The first region has eight segments, narrowed behind, and marked by a dorsal and a 

 ventral longitudinal band ; the ninth segment is remarkably narrow. The third region is 

 larger than the first, continues of considerable breadth for some distance, and then 

 gradually tapers to the tail, which ends in a rounded border, the anus being within it, and 

 with a short subulate cirrus on each side. The lateral regions of the greater part of the 

 third division of the body are modified. The dorsal lamellse of the first region are scoop- 

 shaped, and the ventral are similar though smaller. The bristles are capillary. The 

 bristles of the ninth segment are shaped like a mace with a process at the tip, and differ 

 from all the others as do the lamellae. The third or posterior region has in each foot a 

 row of winged hooks dorsally, and another ventrally at the edge of the quadrangular 

 body, whilst the somewhat ovate lamellae are between them. 



Synonyms. 



1858. Magelona papillicomis, F. Miiller. Arch. f. Naturges., Bd. xxiv, p. 216. 

 1865. Moe.a mirabilis, Carrington. Annel. Southport, p. 9. 



» » „ Johnston. Cat. Worms Brit. Mus., p. 278. 



„ Magelona papillicomis, Be Quatrefages. Annel. , t. ii, p. 290. 

 1874. Mea mirabilis, Mcintosh. Ann. Nat. Hist., ser. 4, vol. xiv, p. 202. 

 18^5. „ „ idem. Invert, and Fishes St. Andrews, p. 126. 



1878. Magelona papillicomis, idem. Zeitschr. f . wiss. ZooL, Bd. xxxi, p. 401, pi. xxix— xxxviii. 

 1^®' » „ idem. Jonrn. Anat. and Physiol, vol. xiii, p. 331. 



1883. Prlonospio tenuis, Fewkes. Bull. Mus. Comp. Zool., vol. xi, p. 167, pi. i, figs. 1—13. 

 1886. Magelona papillicomis, Giard. Bull. Sc. Fr. Belg., 2 e ser., t. ix, p. 98. 



„ Mea mirabilis, Harvey Gibson. First Rep. Fauna Liverp. Bay, p. 155. 

 1888. Magelona papillicomis, Cunningham and Ramage. Trans. Roy. Soc. Edinb., vol. xxxiii, p. 642, 



pi. xxxviii, fig. 6. 

 1890. Magelona papillicomis, Malaquin. Annel. Boulonn., p. 47. 

 189 *• » » Hornell. Trans. Biol. Soc. Liverp., vol. v, p. 255. 



1893 * » » Lo Bianco. Atti Accad. Sc. Nap., ser. 2, t. v, p. 34, pi. iii, fig. 2. 



1894 » •> ^e St. Joseph. Ann. Sc. nat., 7 e ser., t. xvii, p. 83, pi. iv, fig. 104. 



