358 STAUEOCEPHALUS KEFEESTEINI. 



2. Staueocephalus Kefersteini, Mcintosh, 1869. Plate LV, fig. 2; Plate LXI, fig. 8— 

 teeth; Plate LXXIII, fig. 5— feet; Plate LXXXI, figs. 10-10 b— bristles. 



Specific Characters. — Head bluntly conical; eyes two, black, at its posterior border. 

 A moniliform tentacle springs from the outer side of each eye ; palpi long with terminal 

 articulation. Body slender, elongate, terminating in two articulated cirri. First of the 

 two naked segments the broader. Colour orange, with pale head, tail, and feet. Proboscis 

 with a double row of teeth as in 8. rubrovittatus, but smaller. Lower and inner row of 

 dark brown curved teeth with a median and one or two lateral points, with lateral wings. 

 Interiorly it terminates in a long process with alternately large and small teeth. Outer 

 and upper row consists of amber-coloured teeth of similar but more slender form. 

 Toward the lower end more than one small tooth intervenes between the longer. Man- 

 dibles brownish-black, clavate, and with about five denticulations on the edge. Foot when 

 fully developed stout, with ovate dorsal lobe. Setigerous region with a single pale spine at 

 the base and a few stout, straight, translucent bristles, the shaft being dilated and then 

 bifid at the end, one end having a claw, the other being simply pointed. Below are a 

 few slender bristles with straight shafts and curved tapered tips which are finely serrate. 

 Beneath the spine are five or six bristles with curved shafts dilated at the end, and with 

 a few serrations, and terminal pieces which vary from above downward. The tips of the 

 latter are really bifid. 



Synonyms. 



1869. Staurocephalus Kefersteini, Mcintosh. Trans. E. Soc. Edin., xxv ; pt. ii ; p. 417, pi. xvi ; f. 11 a-a. 

 1879. , } , } Grube. Jahresb. Schles. Gresellsch., p. 112. 



1895. ;; „ Pruvofc and Eacovitza. Arch. Zool. exper., 3° ser. ; vol. iii ; p. 372. 



1902. „ „ Mcintosh. Ann. Nat. Hist. ser. 7, vol. x, p. 257. 



Habitat. — Under stones near low-water mark on both eastern and western shores of 

 North Uist, Outer Hebrides. One occurred in an old tube of Serpula and another was 

 dredged in Loch Portan (an inland sea more or less brackish) in three to four fathoms. 



Head (Plate LV, fig. 2) conical, snout rounded, forming the blunt apex of the cone. 

 Eyes two, of moderate size, black, situated toward the posterior border of the head. 

 A tentacle springs from the outer side of each eye, and is annulated or moniliform. 

 They seem to be about as long as the diameter of the head in life. The palpi arise from 

 the infero-lateral region of the head, have a short terminal articulation, marked off by a 

 constriction, and are proportionally long. They are often coiled and twisted in a grace- 

 ful manner, and both they and the tentacles are pale. 



Body slender, elongated, composed of many segments, and terminating posteriorly 

 in two pale articulated cirri of moderate length and with two shorter cirri in front of 

 them, shorter than in Keferstein's S. ciliatus. In general outline it resembles a Syllis, 

 and is about an inch in length. Colour orange, paler at head and tail, the feet being also 

 pale. The orange band on the dorsum curves inward opposite each foot, and slightly 

 outward at each segment-junction. Two reddish lines proceed backward from the head 

 and appear to be due to vessels, as waves passed from behind forward. In the example 

 from Loch Portan a faintly marked dark bar occurred at the posterior part of each 



