NEREIS LONGISSIMA. 325 



7. Nereis longisslma, Johnston, 1840. Plate LXI, figs. 1-16 — head; Plate LXXIII, 

 figs. 1-1 d — feet; Plate LXXXI, figs. 6 and 6 a — bristles. 



Specific Characters. — Head small, broader posteriorly, and tapering to a narrow snout, 

 bearing two tentacles of moderate length. Eyes obscure, in some preparations only 

 indicated by the duskiness of the thick cuticle in the ordinary position. Tentacular cirri 

 short. Body elongated, 10 ins. to a foot or more in length. The peristomium is considerably 

 wider than the next segment. Colour slate-blue in front and finely iridescent. Vent-rally 

 the surface is lilac. Proboscis dark bluish ; maxillae dark brown, seven teeth. Proximal 

 and distal regions in extrusion mottled, and marked by grooves into areas. In some no 

 paragnathi occur, but in an epitokous female the basal segment dorsally has on the usual 

 eminence on each side four small brownish-black paragnathi (VI). Moreover, on the 

 ventral aspect of the distal section an irregular dark brownish patch (IV) appears on each 

 side near the base of the jaws. The first foot has moderately developed dorsal and 

 ventral cirri, only a little shorter than the elongated and pointed dorsal and ventral lobes. 

 The intermediate setigerous lobe forms a small papilla. The feet generally are characterized 

 by three long lanceolate and pointed lobes, a trificl inferior setigerous lobe, and the cirri 

 are short. The bristles consist chiefly of those with long, slender, tapering tips, but beneath 

 the upper series (above the spine) in the inferior setigerous process is a group of those 

 with short falcate tips (heterogomph), longer, however, than those of the previous 

 species. 



In the epitokous form great lobes are developed (e.g., sixty-seventh foot) dorsally, on 

 the posterior surface of the inferior setigerous lobe, and at the ventral cirrus, whilst all 

 the other lobes are expanded. Swimming bristles are present. This condition continues 

 till near the tip of the tail. 



Synonyms. 



Atohous Form. 



J800. Die faserige Nereide, 0. F. Miiller. Naturges. einiger Wurm-Arten., p. 144, Tab. viii, f. 1 — 3. 

 1825. Nereis longisslma (Saw.), De Blainville. Diet. So. Nat., xxxiv, p. 443. 

 1850. „ regia, De Quatrefages. Ann. So. Nat., 3 e ser., Zool., t. xiv, p. 339. 

 1865. „ ,, idem. Annel., i, p. 511. 



J} , } edenticidata, idem. Ibid., p. 538, pi. vii, f. 1 and 2. 



„ longisslma, idem. Ibid., p. 581. 

 1869. „ „ Grube. Abh. S.chl. Gesell., 1868-9, p. 100. 



1874. „ „ idem. Jahresb. Schl. Gesell., 1873, p. 69. 



, Eunereis „ Malm. Goteh. vet. o. vitt. Handl., xiv, p. 84. 



1876. Typhlonereis gracilis, Hansen (?). Nyt Mag. f. Naturvid., xxiv, 1 Hefte, p. 4, Tab. iii, f. 6 — 10. 

 1879. Nereis longisslma, Tauber. Annul. Danic, p. 100. 



1883. ,, „ Levinsen. Vidensk. Meddel. Foren. Kjobenh., p. 233. 



1890. Ceratonerels longisslma, Malaquiu. Annel. Boulon., p. 28. 

 1898. Eunereis ,, De St. Joseph. Ann. Sc. Nat., 8 e ser., t. v, p. 304, pi. xvi, f. 88—100, 



and pi. xvii, f. 101. 

 1902. „ >j Mcintosh. Ann. Nat. Hist., ser. 7, vol. x, p. 256. 



1904. „ ,, Allen. Jo urn. M. B. A., n.s., vol. vii, p. 224. 



