240 



POTAMILLA TORBLLI. 



tinted with brownish and grey pigment. Body small, about 1 inch in length (Plymouth), 

 grooved anteriorly on the dorsum, flattened ventrally, and with the median groove behind 

 the five to eight anterior segments. The posterior region has from thirty to fifty or 

 more segments, and ends in an anus often with a lateral projection on each side. Colour 

 brownish with large spots of white. 



The anterior bristles are in two groups, viz. an upper series with longer shafts and 

 tapered winged tips, and an inferior group of spatulate forms with a filiform process at 

 the tip. The bristles of the posterior region have comparatively broad wings and finely 

 tapered tips, those near the tail being extremely attenuated. Anterior hooks with a 

 moderately long base, a sharp main fang with a series of minute teeth above it. They are 

 accompanied by the short (pennon-like) bristles with the spatulate tips (hook-like). The 

 posterior hooks are smaller and have a shorter base. Scissiparous (Caullery and Mesnil). 



1851. 



1863. 

 1865. 



1867. 

 1880. 

 1881. 

 1883. 



1884. 

 1885. 



1892. 

 1893. 

 1894. 

 1901. 

 1904. 

 1906. 

 1908. 

 1909. 

 1910. 

 1911. 

 1913. 

 1914, 



>) 

 1915. 



>■> 

 1916. 



)) 

 1917. 



Synonyms. 

 Sabella neglecta, Sars. Nyt Mag., vi, p. 132. 



„ fragilis, Grrube. Archiv f. Naturges., Bd. xxix, p. 61, Taf. vi, fig. 6. 

 Potamilla Torelli, Malmgren. Nord. Hafs.- Annul., p. 402. 



„ „ idem. Annul. Polych., p. 222, Tab. xiv, fig. 76. 



Sabella (Potamilla) Torelli, Langerhans. Zeitschr. f. wiss. Zool., xxxiv, p. 112, pi. v, fig. 26. 

 „ „ breviberbis, idem. Nova Acta Leop. Carol. Akad. Naturf., xlii, p. 118, fig. 27. 



„ fragilis, Levinsen. Vidensk. Mecldel., p. 187. 

 Potamilla incerta, Langerhans. Zeitschr. f. wiss. Zool., xl, p. 267, pi. xvi, fig. 29. 



„ Torelli, Mcintosh. Annel. " Challenger/' p. 484, pi. liii, fig. 2, and pi. xxix, figs. 



16—19. 

 „ ,, Marenzeller. Denks. k. Akad. wiss. Wien, xlix, p. 210, Taf. iii, fig. 1. 



„ „ Cams. Fauna Medit., i, p. 272. 



Sabella, neglecta, Marenzeller. Zool. Jahrb., Bd. vi, p. 429. 

 Potamilla Torelli, Lo Bianco. Atti R. Accad. Sc. Nap., 2nd ser., vol. v, No. 11, p. 71. 



De St. Joseph. Ann. Sc. nat., 7 e ser., t. xvii, p. 296, pi. xi, figs. 299—302. 



Whiteaves. Mar. Invert. E. Canada, p. 72. 



Journ. M. B. A., vol. vii, p. 231. 



TreadwelL U.S. Comm. F. & F., p. 1178. 



Ehlers. Deutsch. Tiefsee Exped., p. 156. 



Fauvel. Bull. Inst. Oceanogr., cxlii, p. 42. 



Elwes. Journ. M. B. A., vol. ix, p. 65. 



Mesnil and Caullery. Bull. Sc. Fr. et Belg., 7 e ser., t. xlv, p. 89, pis. v and vi. 



Ehlers. Deut. Siidpol. Exped., p. 575. 



Southern. Proc. Boy. Irish Acad., vol. xxxi, No. 47, p. 139. 



Fauvel. Campag. Scient. Monaco, xlvi, p. 314. 



Allen. Journ. M. B. A., vol. x, p. 642. 



Southern. Irish Sc. Invest., No. 3, p. 49. 



Mcintosh. Ann. Nat. Hist., ser. 8, vol. xvi, p. 11. 



(young of P. torelli), idem. Ibid., ser. 8, vol. xvi, p. 15. 



Rioja. Annel. Poliq. Cantab., p. 65. 



Habitat. — Plymouth and as P. incerta (Allen) ; Torquay, in limestone rocks (Elwes) ; 

 "West Coast of Ireland (Southern). 



