Gatty Marine Labor atory^ St. Andrews. 561 



winged bristles as far as the 24thj when wiugefl hooks 

 appear. The spines are black. The tapering winged bristles 

 disappear before the 60th foot, the posterior feet having only 

 the winged hooks and black spines. The feet increase in 

 length posteriorly, and the posterior lobe becomes pointed. 

 The body ends in four short papillae (cirri), the dorsal pair 

 being the longer. 



Another species also common in the south is Lumbri- 

 conereis Nnrdonis, Grube, the head of which forms a blunt 

 cone with a band in the centre posteriorly attached to the 

 succeeding segment, and at each side of the band is a dimple 

 which receives a process from the first segment. The 1st 

 foot has pale spines, a short bluntly conical posterior flap, 

 winged tapering bristles superiorly and inferiorly, and a few 

 winged jointed hooks, the ends of which have four or five 

 spines. Simple winged hooks by-and-by take the place of 

 the jointed bristles. 



There is a close resemblance between this species and 

 such forms as the Lumbrico nereis oxychreta of C. Gravier'^. 



A third form [Lumbriconereis asshnUls) Avas dredged by 

 Dr. Gwyn Jeffreys 25 miles off North Unst, Shetland, in 

 90 fathoms, in July 1868, and it also occurred in the muddy 

 tuhes of Pa7it kalis (Erstedi kindly sent by Prof. Herdman from 

 the Irish Sea. The head forms a blunt cone and the dental 

 apparatus is similar to that oi L. fragilis. The 1st foot is 

 distinguished by the occurrence of long, narrow, wing(d 

 hooks and of black spines. The winged hooks become modi- 

 fied, so that at the 20th foot they are considerably shorter. 

 Posteriorly the chief fang of the hook becomes much larger, 

 the Aving shorter, and the shaft stronger as well as shorter. 



A fourth was dredged in 90 fathoms,. 25 miles Avest of 

 the Blasquet, S.W. Ireland, by Dr. Gwyn Jeffreys, in May 

 1867. In this {Lumbriconereis hibernica) the head is conical, 

 and the 1st foot has three or four pale spines and tAvo groups 

 of tapering Avinged bristles. The 10th foot has four pale 

 spines and dorsally Avinged tapering bristles, whilst ventrally 

 are characteristically tapered simple hooks, which in the 

 posterior part of the body become very short, with broad 

 Avings. 



The fifth British form is Lumbriconereis yracilis, Ehlers, 

 a widely distributed species ranging from the western shores 

 of Scotland and Ireland to the Mediterranean and to NorAvay. 

 The head is also conical and the dental apparatus a^-proaches 

 that of L. tinyeiis. The 1st foot has tapering Avinged 



* Nouv. Arch. Mus. Taris, 4*^ sdr. ii. p. 21 o, pi. xiv. figs. 96-98. 

 Ann. & Mag. N. Hist. Ser. 7. Vol. xi. 39 



