210 TBREBELblDES STRffiML 



posterior region has from thirty-five to forty segments. Colour reddish or pale orange 

 anteriorly, marked with red laterally. Posteriorly it is greyisli yellow from the colour 

 of the mud in the intestine. Males are paler ; females roseate. Branchiae are of a 

 deeper red. Each of the upper pair arises by a rather thick, fluted stem from the second 

 and third segments, the main divisions being dorsal, each having a basal process directed 

 backward and a fusiform dorsal region composed of vascular lamellae. The inferior 

 divisions are much smaller. The stomach is remarkable for the complexity of its folds, 

 the lateral chambers presenting a series of rings. In Octobranchus the stomach has two 

 lateral chambers. The first setigerous process commences on the second segment (third, 

 Hessle), and it and the second are smaller than those which follow. Bristles in a single 

 series, the stouter dorsal and the more slender ventral in position. Anterior hooks 

 commence on the sixth segment, and have a long, slightly curved, finely striated shaft which 

 diminishes after the shoulder, the neck being bent a little backward and with a main 

 fang and four teeth in lateral view above it. The posterior hooks are avicular, with a 

 deep dimple above the base posteriorly and three large teeth above the chief fang. Base 

 convex inferiorly and the anterior prow is short. Tube of soft grey mud or of sand, 

 friable. 



Synonyms. 



1835. Terebellides Stroemii, Sars. Beskriv. og Iagttagelser, p. 48, Tab. xiii, fig. 31 a — d. 

 1843-53. „ strcemi, Chenu. Illust. Conch., ll e livr., pi. iv, fig. 8. 



1846. Corephorus elegans, Grube. Arch. f. Naturgesch v Bd. xii, p. 161, Taf. v, fig. 1. 

 1851. Terebellides Stromii, Sars. Nyt Mag., Bd. vi, pp. 131 and 206. 



„ „ strcemi, Grube. Fam. Annel., pp. 81 and 138. 



,, Terebella pecten, Dalyell. Pow. Creat., vol. ii, p. 208, pi. xxvi, fig. 

 1853. Terebellides Stromii, Sars. Nyt Mag., Bd. vii, pp. 386 and 390. 

 1859. „ stroemi, Danielssen. Kgl. Norske Vid.-Selsk. Skrift., 4 de Bd., p. 123. 



1861. „ stroemii, idem. Nyt Mag., xi, p. 55. 



1863. „ stroemi, Loven. Foredrag Skandin. Nat. Sallsk. for. Offer)., p. 6 (sep. c). 



1864. ,, „ Grube. Insel Lussin, p. 89. 



1865. „ ,, De Quatrefages. Annel., t. ii, p. 374. 



„ „ „ Johnston. Cat. Worms Brit. Mus., pp. 242 and 345. 



1869. „ Stromii, D. Robertson. Proc. Nat. Hist. Soc. Glasgow, i, p. 84. 



1871. ,, stroemi, Ehlers. Ann. Nat. Hist., ser. 4, vol. viii, p. 57. 



1873. „ „ Verrill. Rep. Fish Com., p. 613. 



v ,, stroemii, Kupffer. Jahres. Kom. deutsch., p. 152. 



,, „ stroemi, Moebius. Exped. Ostsee, pp. 109 and 152. 



1874. „ „ Mcintosh. Ann. Nat. Hist., ser. 4, vol. xiv, p. 205. 

 „ „ „ and gracilis, Malm. Goteborg Fauna, p. 100. 



1875. „ „ Mcintosh. Invert, and Fishes St. Andrews, p. 130. 

 „ „ „ Ehlers. Zeitschr. f. w. Zool., Bd. xxv, p. 23. 



1877. „ „ Grrube. Monatsb. Konigl. Akad. Wiss. Berlin Aug., p. 511. 



; , „ stromi, Marenzeller. Denksch. Kaiserl. Akad. Wiss. Wien, Bd. xxxv, p. 36, sep. abd. 



1878. „ Stroemii, Mcintosh. Trans. Linn. Soc, ser. 2, Zool, p. 508. 

 „ „ stroemi, Lenz. Jahresb. Com. deutsch. Meere., p. 11. 



1879. „ „ Theel. Kgl. Sv. Yet. Akad. Handl., Bd. xvi, p. 64. 



