164 PIONOSYLLIS (?) DIVARICATA. 



front, and the terminal piece of the bristles is rather broad. The rapid widening below 

 the tip is noteworthy (Plate LXXVIII, fig. 14 c). One example has a developing bud, 

 about the fortieth segment, with two widely-separated dorsal eyes, and the foot has a tuft 

 of swimming-bristles which do not yet extend beyond the jointed forms. 



This species approaches Malmgren's P. compacta, from which, however, it is easily 

 differentiated by the shorter terminal piece of the compound bristles, the longer and more 

 distinctly moniliform cirri (Malmgren's form having these organs indistinctly articu- 

 lated), the absence of the elongated simple bristles in the non-budding animal, and the 

 greater length of the palpi. 



The Syllis (Typosyllis) variegata of Grube seems to be this form. 



G-ravier (1900) describes the pharynx as reddish ochre, and as armed with a large 

 tooth in front. The Syllis (Typosyllis) exilis, S. Bouveri, and S. compacta of this author 

 seem to be closely allied forms, probably also falling under Malmgren's genus Pionosyllis. 



De St. Joseph (1906) describes examples from St. Raphael with longer appendages 

 than the British. Thus he gives the tentacles thirty-six, and the tentacular cirri no less 

 than ninety articulations. The dorsal cirri, again, show fifty segments. He also mentions 

 the violet eggs in the stolon. 



2. Pionosyllis (?) divaricate, Keferstein, 1862. Plate LIX, fig. 12— head; Plate LXX, 

 fig. 7— foot; Plate LXXVIII, figs. 17 a and 17 b— bristles. 



Specific Characters. — Head resembling that of Syllis, with two large, simple palpi ; 

 eyes four, red, in pairs close together on each side, the anterior considerably the larger, 

 besides an additional eye-speck at the base of each lateral tentacle (Keferstein) but not 

 visible in the spirit preparations, a long median tentacle just in front of the eyes, and two 

 on the anterior border of the snout. Body about one inch long, with a considerable number 

 of segments (45 — 55), tapering a little anteriorly and still more so posteriorly. Dull 

 brownish, paler in the first fourth, and from this a dull, yellow, median stripe proceeds to 

 the tail, with brownish spurs at each side crossing the dorsum at the segment-junctions. 

 Under surface pale brownish. Proboscis is a short cylinder with a smooth, distal edge 

 and a brown interior with a prominent dorsal tooth. The foot has a long, filiform, dorsal 

 cirrus, often coiled like a screw. The dorsal division has a single, stout spine which 

 appears only before the swimming-bristles at maturity. The ventral division has a very 

 long, setigerous region slightly bevelled and bifid at the tip, with several spines, and a 

 series of slender bristles having a short dilatation at the tip of the shaft which has a few 

 serrations on the convex edge. The terminal blade is flattened, narrow, diminishing little 

 towards the tip, which is rather abruptly hooked, and has a slender secondary process 

 beneath. Ventral cirrus somewhat lanceolate, curved, and though carried far outward 

 does not reach the tip of the setigerous lobe. 



Synonyms. 



1844-5. Syllis {Syllides) longocirrata, CErsted. Kroyer's Nat. Tids., p. 408 (?). 



1862. „ divaricata, Keferstein. Zeitsch. f. w. Zool., Bd. xii, p. Ill, Taf. ix, f. 45 — 47. 



