NEREIS CULTRIFERA. 283 



1902. Nereis cultrifera, Mcintosh. Ann. Nat. Hist., ser. 7, vol. x, p. 256. 



1904. „ 



1905. „ 



1906. Lipephile 

 „ Perinereis 



,, Nereis 

 1909. „ 



Allen. Journ. M. B. A., N.s., vol. vii, p. 224. 

 Graeffe. Arbeit. Zool. Stat. Triest, xv ; p. 322. 

 (movements), Bohn. Ann. Sc. Nat., 9 e ser., t. iii, p. 80. 

 De St. Joseph. Ann. Sc. Nat., 9 e ser., t. iii, p. 221. 

 Eisig". Fauna u. Fl. Neap., xxviii, p. 207. 

 Elwes. Journ. M. B. A., n.s., vol. viii, p. 352. 



Heteronereid Form. 



1825. 



Nereis 



1828. 



>) 



1833. 



)) 



>) 



>j 



1834. 



)> 



1837. 



Lycoris 



1851. 



Nereis 



1820. Lycoris lobulata, Savigny. Syst. de Annel., p. 30. 



„ De Blainville. Diet. Sc. Nat., xxxiv, p. 430. 



„ idem. Ibid., lvii, p. 468. 



„ Audouin and Edwards. Ann. Sc. Nat., t. xxix, p. 123, pi. xiii, f. 7, 8. 



„ idem. Ibid., p. 124. 



„ idem. Annel. da lit. France, ii, p. 191, pi, ivA, f. 7 and 8. 



„ Rathke. Beitr. z. Fauna der Krym. in Mem. fAcad. St. Petersb., t. iii, p. 415, 



Taf. vii, f. 2, 9—15. 

 , Grube. Fam. Annel., pp. 50 and 127. 



1865. Heteronereid lobulata, Johnston. Cat. Worms Brit. Mus., pp. 161 and 341 (partim). 

 „ Nereilepas lobidatus, De Quatrefages. Annel., i, p. 560. 

 „ Hedyle lobulata, Malmgren. Nord. Hafs-Annul., p. 182. 



1867. „ „ idem. Annul. Polych., p. 58. 



1868. „ „ Ehlers. Borstenw., ut antea. 



1870. Nereid (Lipephile) cultrifera, Claparede. Suppl. Annel. Nap., p. 75, pi. vii, f. 1. 

 1898. Perinereis cultrifera, De St. Joseph. Ann. Sc. Nat., 8 e ser., tome v, p. 318. 



Habitat. — Between tide-marks on both eastern and western shores of Britain (from 

 Shetland to the Channel Islands), under stones, and in tunnels in masses of peat. 

 Extends also to both shores of Ireland, especially the western, as at Dingle Bay and 

 Valentia Harbour (J. G. Jeffreys). 



Ranges to the Mediterranean, shores of France (De St. Joseph), Canaries (Langerhans), 

 Black Sea (Bobretzky). 



Head (Plate LX, fig. 7) with a rectangular posterior region on which are the four 

 large eyes, the posterior pair often rendered obscure by the dark mottled pigment. 

 The anterior eyes are wider apart. The front part of the head is bluntly conical, the 

 truncated anterior region bearing two short tapering tentacles, which are somewhat less 

 flattened than in N. pelagica. Moreover, a marked median furrow, often boldly indicated 

 by the arrangement of pigment, passes along the centre of this region, leaving two lateral 

 fillets. The palpi are massive, the distal papillae encircled by a band of brown at the 

 base and with a pale tip. The inner border of each palpus is fused to the conical anterior 

 region of the prostomium almost to the bases of the anterior tentacles, a diagnostic 

 feature in comparing with N. pelagica. The two pairs of tentacular cirri are similarly 

 situated to those of the latter species, the dorsal being the longer in each case. The 

 dorsal of the second pair is nearly twice as long as that of the anterior pair. 



Body proportionally more elongate than in N. pelagica, some nearly reaching a foot 

 in length, very little tapered anteriorly, but much more so posteriorly, where it terminates 

 in two long slender cirri. The peristomial segment is broader than the succeeding, 



