LUMBPICONEREIS GRACILIS. 385 



main fang is well marked, and there are three or four spikes above it. A single winged 

 and finely tapered ventral bristle is usually present. 



The condition remains much the same (Plate LXXXII, fig. 5 d) as the foregoing to 

 the sixtieth foot, beyond which none of the specimens were of service. The differentiation 

 into an upper stouter and a lower more slender set of dorsal bristles continues as far as 

 this foot. The lobes of the feet are nearly equal in this region. Only in the anterior 

 third does the posterior lobe stand backward and outward, and even there the foot has a 

 slightly truncate appearance. 



This form seems to be different from any of the preceding. 



5. Lumbrioonereis gracilis, Ehlers, 1868. Plate LXII, figs. 4 and 4 a— head ; Plate 



LXXXII, figs. 6 and 6 a — bristles. 



Specific Characters. — Head forms a blunt cone. Body small, elongated, and finely 

 iridescent, tapering posteriorly to a slender tail. The colour is reddish or brownish- 

 orange (Pruvot and Racovitza). Proboscis with a pair of curved maxillse which articulate 

 posteriorly with a process having a short anterior and a long tapered posterior region. 

 Each great dental plate has four teeth. The antero-lateral plates are two in number on 

 each side, each with a tooth. Mandibles anchylosed in front, the edge presenting a 

 double crescent, an inner and an outer. The external edge has a pigmented shelf or 

 process. First foot has a small triangular posterior lobe and about four pale spines and 

 tapering simple winged bristles, the adjacent end of the shaft likewise having two wings. 

 The jointed hooks have a short terminal piece with a crown of small hooks and two wings, 

 and broad wings occur on the distal end of the shaft. This hook continues to the fifteenth 

 foot and then disappears, its place being taken by simple winged hooks which by-and-by 

 become stout, the chief fang being strong, whilst above it are three or four erect spines 

 on the crown. As a rule two pale spines are present in each foot, and the latter is 

 bi-papillose from the tenth backward. 



Synonyms. 



1868. Luml>riconereis gracilis, Ehlers. Borstenw., p. 893, Taf. xvii, f. 6 — 10. 



1879. ,, „ Langerhans. Zeitsclir. f. wiss. ZooL, xxxhi, p. 298, f. 31. 



1885. „ „ Cams. Fauna Medit., p. 215. 



1903. „ „ Mcintosh. Ann. Nat, Hist,, ser. 7, vol. xi, p. 561. 



Habitat. — First procured on muddy ground mixed with clay (eight to nine fathoms) 

 in Lochmaddy, August, 1865. Coast of Kerry (A. G. Moore). S.W. Ireland, log 23, 

 in thirty-five to thirty-seven fathoms, II. I. Acad. Exped., 1885 ; in Bantry Bay, five 

 and a half fathoms ; and in Loch Slyne, Co. Cork, in 1886. Dredged in the ' Porcupine ' 

 Expedition of 1869 in 370 fathoms off Ireland. Dredged in ninety fathoms twenty-five 

 miles west of the Blasquet, S.W. Ireland, by Dr. Gwyn Jeffreys, May 25th, 1869, and by 

 the same naturalist in one hundred fathoms in St. Magnus Bay. In the stomach of the 

 haddock, St. Andrews (E. M.). 



106 



