236 PIONOSYLLIS LAMBLLIGBRA. 



of translucent bristles with cylindrical shafts and a distinct backward bend at the tip 

 (Plate LXXXVI, fig. 11) which is dilated and bevelled for articulation with the terminal 

 piece, which is of moderate length and has a hook at the tip. A minute secondary 

 process appears beneath it, and the front edge of the terminal piece is probably minutely 

 spinous, though this was not actually seen. Besides these both in the anterior and 

 posterior regions a single simple bristle is present, and the tip of the solitary spine is 

 slightly bent. The ventral cirrus is small and somewhat conical. 



In the examples described by De St. Joseph (1886) the body was 2 mm. long, and 

 the number of segments ranged from twenty-seven to thirty-four. Both pairs of eyes 

 had lenses, the anterior being directed to the front, the posterior backward. 



Reprorhiction. — De St. Joseph found the ripe males of a pale orange hue from the 

 sperms, which extended from the tenth to the ante-penultimate segment. The females 

 bore the eggs on the dorsum ; and in an example with thirty-one segments there were 

 eighty-six eggs from segments eight to twenty-six, and in another with thirty-four bristled 

 segments four eggs occurred on each segment from the ninth to the twenty-eighth — in all 

 eighty. The eggs are attached by the transparent capsule, and he described the appear- 

 ance of the advanced embryos. Swimming bristles are absent in all the females. 



This species was first found by Claparede (1863) on the coast of Normandy, his largest 

 example having twenty -two segments. He correctly interpreted the structure of the foot, 

 but he did not allude to that of the bristles. The same form he obtained at Port-Vendres 

 next year. De Quatrefages (1865) then described it from the coast of Brittany under 

 the title of Grubea fusigera, having constituted the genus Grubea for its reception, and 

 he gave a detailed account of its general structure with figures; but he made several 

 misinterpretations which were corrected by Claparede in his ' Annelides de Napoli.' 



Langerhans procured the same species at Madeira, and described it as having four 

 anal cirri and bifid tips to the compound bristles. 



Pionosyllis 1 LAMELLIGER.A, De St. Joseph, 1886. Plate LXXXVI, fig. 12 — bristle; Plate 



LXXXVII, fig. 11— foot. 



Specific Characters. — Head rounded in front; four eyes with lenses in a trapezoid, 

 and two smaller specks in front ; a longer median and two shorter lateral tentacles. Palp 

 large, oblong or ovoid ; two tentacular cirri on each side. These and the tentacles in the 

 preparations are moniliform distally. Body slender, little tapered anteriorly, but 

 distinctly so posteriorly, where there are two anal cirri. Length 6 — 7 mm., and segments 

 forty-five to fifty-five. Translucent, marked by three violet bars on the dorsum of each 

 segment. The proboscis has ten soft papillae and a large tooth anteriorly. Proventriculus 

 with twenty-two to twenty- five rows of points. Foot has dorsally a moderately long smooth 

 cirrus ; setigerous region bluntly conical, with translucent compound bristles, the upper 

 series of which has long tips, the lower considerably shorter, and all are bifid, and thus 

 somewhat approaching Syllis cornuta, H. R. Ventral cirrus tongue-shaped. Repro- 

 duction direct ; male of rose-orange hue when ripe ; female has grey or violet eggs (De 

 St. Joseph). 



1 See p. 161. 



