AMPHITRITE FIGULUS. 117 



An extended and careful account was given by De St. Joseph (1894), and he entered 

 into various structural features. 



5. Amphitrite pigulus, Dalyell, 1853. Plate CXIII a, fig. 1— body ; Plate CXXV, 

 figs. 10 and 10 a— bristles ; Plate CXXV a, figs. 1 and 1 a— bristle with double 

 expansion and hook. 



Specific Characters. — Median dorsal collar of the cephalic fold narrow, but the oral 

 arch and the lateral folds are larger than in A. cirrata. Tentacles with a red streak. 



The body is 6 to 8 inches long, enlarged in front, tapered posteriorly and ends in 

 an anus. Segments ninety to one hundred, and of these twenty -four bear bristles com- 

 mencing at the last (third) branchia. Dorsal surface anteriorly in the preparations some- 

 what tessellated. Each segment anteriorly shows dorsally two rings, which by-and-by 

 have transverse furrows. Then as the space between the bristles increases a larger number 

 of rings are present, whilst posteriorly the narrow transverse furrows show less regularity. 

 Ventral scutes fifteen. Various shades of flesh colour, some of the larger being brownish, 

 other pinkish, and marked by the orange intestine posteriorly. Nephridia from the 

 third to the ninth segment (Hessle). 



BranchiaB three on each side on segments 2, 3 and 4, the first the largest, each having 

 a cylindrical stem which soon divides dichotomously, the terminal branches long and 

 tapering, colour dull red. A small conical papilla at the second branchia marks the 

 commencement of the setigerous processes, though it has no bristles. Bristles of two 

 kinds, a longer and shorter series, the shafts of the former long, straight, slightly 

 diminished upward to the winged tip, which is finely tapered. Shorter series with an 

 accessory terminal blade carried at an angle to the region beneath it, and tapered to 

 a slender, slightly curved tip. The rows of hooks commence at the second bristle-tuft, 

 and continue to the posterior end. The third ridge bears the first double row of hooks. 

 These differ from those of A. cirrata in the less oblique base and in the curves of the 

 anterior outline below the great fang ; four teeth occur above the latter in profile. Tube 

 either earthy and friable, or of fragments of shells, minute stones and sandy mud lined 

 by secretion. 



Synonyms. 

 1808. Amphiro constrictor, Montagu. MS. vol. Linn. Soc., pi. xxxv, fig. 3. 

 1843-53. Terebella constrictor, Chenu. Illust. Conch., ll e livr., p. 266, pi. xxiv, fig. 1. 

 1853. Amphitrite brunnea, Stimpson. Fauna Grand Manan, p. 31. 



„ Terebella figulus, Dalyell. Pow. Creat., vol. ii, p. 191, pi. xxvii, figs. 1 and 2. 

 1865 ?. „ nebulosa, Johnston. Cat. Worms. Brit. Mus., pp. 237 and 345 (partim ?). 



„ Amphitrite Johnstoni, Malmgren. Nord. Hafs.- Annul., p. 377, Tab. xxi, fig. 51. 

 1867. „ „ idem. Annul. Polych., p. 107. 



1869. „ ,, Grube. St. Yaast., p. 38. 



„ Terebella figulus, Mcintosh. Trans. Koy. Soc. Edin., vol. xxv, p. 423. 

 1870 ?. Amphitrite nana, Claparede. Suppl. Annel. Nap., p. 129, pi. xiii, fig. 6. 



1873. „ Johnstoni, Mobius. Exped. Ostsee Comm. deutsch., p. 109. 



1874. „ figulus, Mcintosh. Ann. Nat. Hist., ser. 4, vol. xiv, p. 204. 

 33 „ Johnstoni, Malm. Groteborg Fauna, p. 96. 



» » brunnea, Verrill. Check List, p. 10 (U.S. Com. F. and F.). 



