150 NICOLE A VENUSTULA. 



1. Nicolea venustula, Montagu, 1818. Plate CXII, fig. 5 — body; Plate CXIX, figs. 6 

 and 6 a — branchia and ovum; Plate CXX, fig. 12— branchia, and 12 a and 12 6 — 

 branchia, var. zostericola ; Plate CXXVI, figs. 2 — 2 d — bristles and hooks, and 

 2 b" and 2 V" a — bristle and hook of variety. 



Specific Characters. — Cephalic collar forms a small rim dorsally, and behind it is a 

 row of distinct eye-spots. Tentacles numerous and grooved. Body typical, forty to 

 fifty (seventy-four, Marenzeller ; one hundred, Hessle) segments, terminating in an anus 

 posteriorly. Ventral shields thirteen (seventeen, Marenzeller), of a pale brown throughout, 

 sparsely speckled with white spots. 1 Branchise, two pairs variable in length, sometimes 

 with a short, at others with a long stalk, then dichotomously divided with few short terminal 

 branches; the first is considerably the larger. Fourteen glandular plates ventrally. 

 Seventeen setigerous processes on each side (fifteen in young and in those from Scandi- 

 navia). Bristles in single series, with narrow wings on the somewhat long and tapered tips. 

 The first occurs behind the second branchia (fourth segment). The avicular hooks begin 

 on the fifth segment (seventh, Carus), have a single tooth above the chief fang; base 

 somewhat small, the lower edge evenly convex, and the process on the anterior edge 

 curves upward. Nephridia in segments 3 — 7; in the male the nephridial papilla in 

 the sixth and seventh segments cirriform. Colour reddish brown with white spots. 

 Frequents soft tubes of sand and mud. 



Synonyms. 



1818. Terebella venustula, Montagu. Trans. Linn. Soc, vol. xii, p. 344, Tab. xiii, fig. 2. 

 longicornis, Sars. Bidrag., p. 28. 



venustula, Chenu. Illust. Conch., ll e livr., pi. iv, fig. 3. 

 zostericola, (Ersted. Region. Mar., p. 68. 

 venustula, Chenu. Bibl. Conch., t. i e , p. 266, pi. xxiv, fig. 2. 

 parvula, Leuckart. Arch. f. Naturges., 15 Jahrg., p. 175, Taf. iii, fig. 6. 

 venustula, Grube. Fam. Annel., p. 81. 

 zostericola, idem. Ibid., p. 81. 



textrix, Daly ell. Pow. Great., vol. ii, p. 206, pi. xxvii, figs. 15 — 18. 

 zostericola, Grube. Arch. f. Naturges., Bd. xxvi, p. 98. 



„ Malmgren. Nord. Hafs.-Annul., p. 381, Tab. xxvi, fig. 76. 



„ De Quatrefages. Annel., torn, ii, pp. 372 and 397. 



„ Terebella venustula, Johnston. Cat. Worms Brit. Mus., p. 238. 

 „ „ textrix, idem. Ibid., pp. 239 and 345. 



1867. Nicolea zostericola, Malmgren. Annul. Polych., p. 109. 

 „ Terebella venustula, Parfitt. Cat. Devon Annel., p. 32. 

 1868 (?). „ vestita, Claparede. Annel. Nap., p. 397, pi. xi, fig. 4. 



zostericola, Mcintosh. Trans. Boy. Soc. Edin., vol. xxv, p. 423, pi. xv, fig. 15. 

 „ Mosbius. Exped. Ostsee, pp. 109 and 152. 



„ and arctica, Kuppfer. Ibid., p. 152. 



„ Malm. Annul. Goteb., p. 97. 



„ „ „ Mcintosh. Ann. Nat. Hist., 4 ser., vol. xiv, p. 205. 



1875. „ „ idem. Invert, and Fishes St. Andrews, p. 129. 



1 First segment with two lateral spines (Carus). Papilla under branchia 2, and behind the 

 setigerous tubercle of 6 and 7, then pinnules to segment 21. 



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