242 EURYSYLLIS PARADOXA. 



lateral cseca. The foot has a more or less globular dorsal cirrus with a basal cirrophore, a 

 short conical setigerous region with translucent bristles, with an enlarged distal end to the 

 shaft and a bevelled region with a very acute point. The terminal piece of the bristle 

 has a simple hook at the tip. Ventral cirrus lanceolate, soldered at the base to the foot. 

 Reproduction by stolons. 



Synonyms. 



1864. Polymastia paradoxus, Claparede. Glanures Zoot., p. 109, pi. viii, fig. 3. 



1864. Eurysyllis tuberculata, Ehlers. Borstenw., i, p. 264, Taf. xi, figs. 4—7. 



1870. „ paradoxa, Langerhans. Zeitschr. f. wiss. Zool., Bd. xxxii, p. 574, pi. xxxii, fig. 27. 



1886. „ (Polymastus) paradoxa, De St. Joseph. Ann. Sc. Nat., 7 e ser., t. i, p. 191, pi. ix, 



figs. 68—74. 

 1908. „ „ „ Elwes. Journ. M. B. A., n.s., vol. viii, p. 201. 



Habitat.— Between tide-marks at Oddicombe Rocks, near Torquay (Elwes). 



Mediterranean (Claparede) ; Atlantic (Langerhans) ; Dinard, France, on dredged 

 shells at a depth of 10 — 25 metres, and on Rytiphloea pinastroides from a depth of 4 — 7 

 metres (De St. Joseph). 



Head (Plate LXXXVII, fig. 3) comparatively small, transversely elongated, and 

 having two lateral processes anteriorly, the anterior eyes being at the base of these 

 or even on them, as Ehlers shows, with four reddish eyes furnished with lenses, and De 

 St. Joseph describes an additional pair of pigment-specks in front. The median tentacle 

 is a broad truncate process, and the two rounded lateral flattened processes represent 

 the lateral tentacles. The palpi form two flattened and somewhat ovoid processes on the 

 ventral surface, their tips only projecting forward in a dorsal view. The tentacular cirri 

 are two; the dorsal have a globular tip articulated to a basal ceratophore. A shorter 

 adnate process of similar shape ventrally represents the ventral cirrus. 



The body is comparatively short and broad as in Sphserosyllis, a little tapered 

 anteriorly before reaching the truncate frontal border, and also slightly tapered pos- 

 teriorly to the two globular anal cirri with a point attached. The bristled segments are 

 about fifty-seven, so that the British examples approach those from the French coast, 

 which have in all sixty-five segments. The colour is reddish or greyish-red. The feet 

 form a somewhat even and regular series from end to end, the dorsal cirri, however, being 

 globular in front and somewhat more elongated posteriorly so as to make a greater 

 proportional difference between their breadth and that of the cirrophore in this region. 

 Moreover, in a form with a reproduced tail these organs and the anal cirri have a 

 tendency to greater elongation than in the ordinary form. Each segment has four 

 tubercles, the buccal alone having two, and these agree in structure with those on 

 the feet. 



The proboscis has ten minute points on the edge anteriorly, besides a large dorsal 

 tooth, preceded by six large papillge (De St. Joseph). The proventriculus is short 

 and almost ovoid in outline and slightly narrower in front, and the stomach has no lateral 

 caeca. The reddish intestine has lateral processes which De St. Joseph thinks contain air 

 as in Trypanosyllis. 



The foot (Plate LXXXVII, fig. 14) has dorsally the cirrus with its basal cirrophore 



