BOLYDOBA FLAVA. 205 



fifth bristled segment resemble those of P. ciliata, and he gives their number as four with 

 a rudiment of a fifth. In P. ciliata adults have a larger number, and this opens the ques- 

 tion as to whether this P. Giardi is not a young form. One difference, however, is 

 apparent, viz. the great prominence of the spur of these hook-like bristles in the so-called 

 P. Giardi, which is flattened and mounted. It may be that they have been specially 

 compressed so as to bring the spur into prominence. The caudal funnel is, according to 

 Mesnil, cylindrical with a large hiatus dorsally, but he adds that there are also a ventral 

 hiatus and two lateral, so that there are four divisions with bacilliparous corpuscles as in 

 Pygospio elegans. His figure of this (Plate XIII, fig. 9), however, would do for an imperfect 

 representation of the funnel of P. ciliata, and the reproduced tail of the sole example from 

 Torquay gives no help. 



At present, therefore, P. Giardi may only be considered as a young stage of a variety 

 of P. ciliata, and it has the same haunts. 



With regard to the Polydora ciliata, var minuta of Langerhans x (1880), nothing 

 more can be made out than that it appears to be a small variety of P. ciliata. 



2. Polydora flava, Glaparede, 1870. Plate XCIII, fig. 3; Plate XCVIII, figs. 16—16d 

 —feet and tail; Plate 0, fig. 10— fifth foot; Plate CVI, figs. 3— 3 c— bristles and 

 hooks. 



Specific Characters. — Bifid prostomium usually longer than in P. ciliata, and the 

 divergent processes more distinct. A little pigment on each side of the prostomium in 

 front. No distinct eyes. Median ridge reaches the fourth bristled segment. Body 

 generally larger (2 in. or more in length) than in P. ciliata but of similar conformation. 

 Segments over 200. Terminal caudal process with an even rim, so as to form a nearly 

 cylindrical cup. 2 Straw-yellow colour with a brownish central streak, and with red dorsal 

 vessel. First foot has a few dorsal bristles. Fifth segment has large hook-like bristles with 

 tips more distinctly curved than in P. ciliata and devoid of spurs. The tip is differentiated 

 in both lateral and antero-posterior views. Dorsal bristles of the anterior twenty 

 segments similar; in the others dissimilar (Carus). Branchise commence on the eighth 

 segment, and are from thirty- five to forty in number. The winged hooks begin on the 

 seventh segment. 



Synonyms. 



1863. Polydora flava, Claparede. Mem. Soc. Pliys. et Hist. Nat. Geneve, t. xx, p. 487. 

 idem. Suppl. Anne I. Neap., p. 123. 

 Panceri. Atti Soc. Ital., vol. xviii, p. 528. 

 Carus. Fauna Medit., p. 257. 

 Eisig. Monogr. Oapitell., p. 335. 



Lo Bianco. Atti B. Accad. Sc. Nap., 2 ser., vol. v, No. 11, p. 31. 

 Carazzi. Mitth. Zool. Stat. Neapel, Bd. xi, p. 22, Taf. ii, figs. 9 and 18. 



1 'Zeitschr. f. wiss. Zool./ Bd. xxxiv, p. 91. 



2 Mesnil states that it has a dorsal notch, and this was also seen at St. Andrews ; but lie adds that 

 it is sometimes absent. 



1870. 



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1875. 



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1885. 



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1887. 



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1893. 



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