78 SAMYTHA SEXCIRRATA. 



The hooks of the foregoing forms diverge from the type, as seen in 8. octocirrata, 

 and lean somewhat toward the type of an Ampharete. The hook certainly differs from 

 Sabellides borealis, which has from five to six teeth. So far as observed neither has yet 

 been detected in British waters, though 8. borealis is common in Canada, Finmark and 

 Norway. 



Bhlers 1 (1875) describes a new species, Sabellides fulva, from the "Porcupine" 

 Expedition of 1869, station 49° 1' N., 11° 56' W. in 557 fathoms, on a bottom of mud and 

 shell-fragments. Its hook has a rudimentary tooth below the upper five. 



Genus CXLI. — Samytha, Holmgren, 1865 (including Amage, Cams). 



Cephalic lobe sub- quadrangular, without glandular bands; frontal region elevated, 

 sub-rectangular, smooth, without a median groove. Buccal segment short. Filiform, 

 smooth tentacles somewhat enlarged at the tip. No palmulae. Three longer filiform 

 branchiae on each side, arising from the third and fourth segments in an interrupted 

 row. Anal segment with two cirri. Setigerous processes seventeen— from the fourth 

 backward. Bristles slightly curved and winged at the tip. 



Uncinigerous pinnules from the fourth bristled segment backward to the posterior 

 end. Uncini sub-triangular, with five long teeth. 



Stomach without an anterior lobe or inner blind sac. Nephridia with comparatively 

 short tubes, that in the fourth longer; they occur also in the fifth segment. The 

 nephridiopores open dorsally (Hessle). 



Malmgren instituted in 1865 the genus Samytha for the Sabellides sexcirrata of 

 Sars, which had smooth tentacles, only three branchiae on each side, seventeen pairs 

 of setigerous processes and the characteristic hooks. 



Hessle (1917) added further information concerning the nephridia. 



1. Samytha sexcirrata, Sars, 1856. Plate CXVIII, fig. 8— body ; Plate CXXIV, figs. 6 



and 6 a — bristle and hook. 



Specific Characters. — Head forming a somewhat broad central process with a lateral 

 peristomial support on each side anteriorly. Beneath is the flap bearing the smooth and 

 somewhat clavate buccal tentacles. Branchiae subulate, filiform, in two groups. Body 

 somewhat clavate with seventeen bristle-bundles in two series, a longer and a shorter, 

 in each tuft, with slightly curved tips and narrow wings. Twelve to eighteen uncini- 

 gerous pinnules posteriorly. Hooks triangular, with a broad crown and four to five 

 teeth anteriorly, about eight posteriorly. No dorsal cirri posteriorly. 



Nephridia in fourth, fifth and sixth segments. 



Synonyms. 

 1856. Sabellides sexcirrata, Sars. Fauna Lit. Norveg., ii, p. 23 — 24. 

 1865. „ „ Be Quatrefages. Annel., t. ii, p. 378. 



1 'Zeitschr. f. wiss. Zool./ Bd. xxv, pp. 27 and 64, Taf. iv, figs. 18—23. 



