198 



POLYCIRKUS CALIENDRUM. 



anterior setigerous segments. Terminal anus papillose. Colour more or less orange, 

 inclining to yellowish saffron. Capillary bristles without wings. Hooks commence on the 

 ninth segment, 1 the anterior being somewhat shorter than the posterior and the base 

 deeper, a single tooth occurring above the main fang, the gulf below showing a very 

 slight, if any, elevation of the outline on the anterior part of the hook. The posterior 

 basal process is larger and less rounded than in P. aurantiacus. The posterior hooks 

 have longer bases, which are obliquely striated at the lower edge. The posterior basal 

 process is larger than in P. aurantiacus. Colour of the male yellowish, of the female 

 darker. 



Synonyms. 



1868. Poly cirrus caliendrum, Claparede. Annel. Chet. Naples, p. 408, pi. xxx, fig. 2. 

 1875. „ „ Panceri. Atti Soc. Ital. Sc. Nat., vol. xviii, p. 231. 



1885. „ „ Cams. Fauna Medit./i, p. 267. 



1893. ,, „ Lo Bianco. Atti E. Accad. Sc. Nap., vol. v, No. 11, p. 59. 



1894. „ „ De St. Joseph. Ann. Sc. nat., 7 e ser., t. xvii, p. 237, pi. x, figs. 263—269. 

 1907. „ „ Soulier. Acad. Sc. Montpell., ser. 2, fc. iii. 



1909. '„ „ Fauvel. Bull. Inst. Oceanogr., p. 38. 



1914. „ ,, Southern. Proc. Boy. Irish Acad., vol. xxxi, No. 47, p. 127. 



1915. „ „ Allen. Journ. M. B. A., vol. x, p. 636. 



,, „ „ Southern. Irish Sc. Invest., No. 3, p. 47. 



1916. „ „ Caullery. Bull. Soc Zool. France, t. xl, p. 242. 



1917. „ „ Hessle. Zool. Bidr. Uppsala, Bd. v, p. 227. 

 „ „ „ Bioja. Anel. Poliq. Cantab., p. 59. 



Habitat. — Plymouth (Allen) ; Blacksod Bay, Clew Bay, Ballynakill Harbour, and 

 Bofin Island, Ireland (Southern). 



Abroad it occurs at Naples in rather deep water (Claparede, Lo Bianco, etc.) ; 

 shores of Cantabria (Rioja) ; shores of France (De St. Joseph). 



This species is so closely allied to P. aurantiacus that much time may be absorbed in 

 discriminating preserved specimens, especially if a minute comparison of the hooks is 

 made. The presence of six segmental organs anteriorly is the only easily recognised 

 distinction. 



Reproduction. — Mature in March and May (Southern). 



4. Polyoirrus HiEMATODES, Claparede, 1864. Plate CXXVII, figs. 2 — -2d! — bristles 



and hooks. 



Specific Characters. — The cephalic plate, supra-oral arch and tentacles similar to 

 those in P. aurantiacus, but the lateral folds are further forward. Body generally as in 

 the species mentioned ; segments 7o — 80. The first (post-oral) segment has ventrally 

 a prominent median scute, lozenge-shaped or rounded, according to its condition, 

 and seven or eight pairs of closely arranged scutes behind it, followed by a series of 



1 Lo Bianco gives the sixth setigerous segment. 



