212 POLYDORA HOPLURA. 



means narrow. The strong main fang comes off at a little more than a right angle, and 

 the tip is somewhat blunt. Moreover, the crown of the fang seems to have the upper 

 edge flattened and prominent on each side, whilst above it a comb-like crest with a 

 serrated edge curves from the back of the crown almost to the point of the fang, so that 

 uncinus crista-galli might be an appropriate name for such a hooked bristle. Indications of 

 strias, which slope from behind forward and upward, show that this crest is an aggregate 

 of spines. The ventral tuft in this segment is small, only a few bristles being present. 



The sixth bristled segment has lamellse and dorsal and ventral bristles (Plate CVI, 

 figs. 5 and 5 a) like the fourth. Winged hooks occur in the ventral of the seventh, and 

 the branchiae would appear to commence in this segment, though the state of the 

 specimen left uncertainty as to the particular foot. 



The hooks (Plate CVI, fig. 5 d) do not offer any diagnostic feature, save their small 

 size, having the same curves and arrangement of the main fang and its spur on the 

 crown as in P. flava and others. The wings arise about the site of the backward curve 

 of the shaft, and the anterior edge passes straight upward to the point of the main fang. 



In contrast with P. flava the lamella* of the feet generally and the bristles are 

 shorter in P. Caidleryi, whilst the hooks project similarly in both. 



The species seems to be sparingly distributed, and at first Mesnil's account was over- 

 looked, the title of P. Carazzi, which now lapses, having been given to it. 



In his account of this as a new species, Mesnil (1897) overlooked, probably from the 

 imperfection of his specimens, the distinctive character of the prostomium. 



5. Polydora hofluea, Olaparede, 1868. Plate CI, fig. 10— posterior hook-like bristle; 



Plate CVI, figs. 6—6 c — bristles and hooks. 



Specific Characters.— -Head similar to that of P. ciliata, except in the absence of the 

 black pigment in the preparations. Eyes four. The prostomial prow has a median notch 

 and two rounded lateral processes. Body of the typical form, 35 mm. long. Segments 

 about 130. Branchiae commence on the seventh foot. Fifth segment bears large hook- 

 like bristles, which are distinguished by the parallel arrangement of the shafts and tips, 

 the latter being peculiarly bent, and by no means sharp ; and they have a strong lateral 

 spur on the neck. Winged hooks occur in the ventral division of the seventh foot, whilst 

 in the last fifteen segments curiously curved sharp hook-like bristles take their 'places. 

 The terminal sucker is somewhat like that of P. ciliata, with a dorsal notch. Colour dull 

 red (Lo Bianco). 



Synonyms. 

 1868. Polydora hoplura, Claparede. Annel. Nap., p. 318, pi. xxii, fig. 2. 

 1875 ' » ■ » Marion and Bobrefczky. Ann. Sc. nat., 6 e ser., t. ii, p. 84. 



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



1879. „ hamata, Webster. Trans. Albany Inst., vol. ix, p. 51. 



188 °- » » Langerhans. Zeitschr. f. wiss. Zool., Bd. xxxiv, p. 91, Taf. iv, fig. 4. 



1883. „ hoplura, Carazzi. Mitt. Zool. Stat. Neapel, Bd. xi, p. 20, Taf. ii, figs. 6 and 7. 



1893 ' » « Lo Bianco. Atti R. Accad. Sc. Nap., 2 ser., vol. v, No. 11, p. 30. 



1894 ' » » De St - Joseph. Ann. Sc. nat., 7 e ser., t. xvii, p. 65. 



