66 AMPHARETE ACUTIFRONS, 



1. Ampharete aoutierons, Grube, 1860. Plate CXII, fig. 3 — entire animal; Plate CXVI, 

 fig. 8 — anterior end ; Plate CXXIV, figs. 4 — 4 c" — paleae, bristles and hooks. 



Specific Characters. — Cephalic lobe more or less pentagonal ; at the posterior border 

 is a minute, simple eye on each side. Buccal segment shorter than the cephalic lobe, 

 its tentacles pennate. Palese have flattened, striated shafts and a tapered tip with a 

 granular interior, whilst the concave edge of the slender tip is crenulate. About fifteen 

 on each side. 



Body measuring 60 — 80 mm., anterior end bluntly conical, only slightly tapered, 

 then diminishing to a somewhat slender tail, which terminates in an anus with about 

 twenty cirri around it. The dorsal surface is smooth and rounded, the ventral somewhat 

 flattened, and with glandular transverse ridges on the wide part in front. The fourteen 

 bristled segments are narrow, whilst the twelve hook-bearing posterior segments 

 are antero-posteriorly elongated. Branchiae on the third and fourth segments, four 

 pairs, simple, subulate. Bristles with a nearly cylindrical shaft, and a finely tapered 

 hair-like tip which has wings. Hooks have six to nine teeth, the anterior border 

 forming a right angle with the axis, whilst the posterior border curves to the 

 prow at the smaller end. Blood green ; dichroic. Nephridia in the fourth and sixth 

 segments. 



Coloration — male pale greenish, female pale salmon. The brownish stomach is seen 

 through the integument and surrounded by a greenish blood-sinus, whilst the anterior 

 lobes of the stomach are brick-red (Fauvel). Tube membranous, covered with 

 agglutinated sand. 



Synonyms. 



1843-53. ? Pherusa Mulleri, Chenu. Illust. Conch., ll e livr., pi. vii, fig. 7. 



1860. Amphicteis acutifrons, Grube. Archiv f. Naturges, Bd. xxvi, p. 109. 



1863. Branchiosabella zostericola, Claparede, Beobach., pp. 34 — 36, pi. xiv, figs. 32 — 37. 



1865. Amphicteis acutifrons, Be Quatrefages. Annel., t. ii, p. 394. 



i, Malmgren. Nord. Hafs. Annul., p. 363, Tab. xix, fig. 44. 



idem. Annul. Polych., p. 104. 



Grube. Jahresb. Schl. Gesell., pp. 68, 69. 



idem. Ibid., p. 78, sep. abdr., p. 11. 



Mobius. Jahr. Comm. deutsche, 1871, p. 109. 



Malm. Annul. Goteborg, Kongl. Yet. Handl., vol. xiv, p. 95. 



Mobius. Jahr. Comm. deutsche, 1872, p. 163. 



Marion. Kev. Sc. nat., iv, p. 308. 



Tauber. Annul. Danica, p. 127. 



Theel. Kongl. Svensk. Vet.-Akad. Handl., vol. xvi, p. 59. 



Wiren. Chaatop. "Vega" Exped., p. 413. 



Levinsen. Yidensk. Meddel., p. 162. 



Marenzeller. Arch. f. nat., Iv, p. 132. 



Hornell. Liverp. Mar. Biol., vol. iii, p. 161. 



idem. Trans. Biol. Soc. Liverp., vol. v, p. 258. 



33 



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