lO: 



situated in front of the posterior margin of tlie head, whereas tlie anterior pair occiir on the 

 lateral prominence. In the Hemilepidia-s^eciGS from the Cape the anterior eyes are placed just 

 beneath the frontal peaks of the head. Of the tentacular cirri the dorsal is at least twice as 

 long as the ventral one. 15 pairs of elytra (PL XXI, hg. 18) are restricted to the anterior 

 region of the body ; each of them is rounded rectangular, with the scar of attachment situated 

 eccentrically. Their surface js densely beset with small, obtuse, spinous tubercles and some 

 small globular papillae occur along their margin. The parapodia (PI. XXI, fig. 1 9) have the noto- 

 podium less developed, containing only some slightly bent bristles of the usual shape, that are 

 fringed till at some distance from the tip ; its anterior lip is triangularly elongated, enclosing 

 the acicula. The neuropodium is much stouter, with a lip, ending into a small bended lobe ; 

 its fascicle consists of a dorsal and a ventral group of bifid setae, with laciniated fringes on 

 the dilated distal part and a bare portion beneath the tip, that bears a short acute tooth. 

 The dorsal cirri are very slender, nearly as long as the breadth ot the body in its middle region, 

 in the posterior part reaching far beyond it ; they are furnished with a few cylindrical papillae. 

 The ventral cirri are much shorter and only reach the distal extremity of the neuropodial 

 fascicle. No dorsal tubercles are present. According to WillI':y^) this species must be ranged 

 in the genus Hcinilepidia Schmarda, comprising the species, in which there are 15 pairs of 

 elytra, restricted to the anterior region of the body : Polynoc scolopendrina^ He^nilepidia ery- 

 throtaenia^ Neniidia torelli and Enipo kinècrgi ; though in the two last species the setae have 

 another shape than in the foregoing. Therefore the association of these species appears some- 

 what heterogeneous (see also Bergström ; die Polynoiden der Schvved. Südpolarexpedition 

 1901 — 03, Zoolog. bidrag fra Uppala, Bd. IV, 1916, p. 279.) Versluys found these worms 

 in ducts, formed by the short branches of Thouarella hilgendorji"), placed close behind each 

 other and having their tips inclined towards each other, thus forming a kind of avenue. Also in 

 other Hydrocorallina commensal Polynoidae are met with ; M.arenzellek found a Z«_^wYa-species, 

 living in ducts of Errina luacrogastra and Stettohelia profzinda^). 



5. Polynoc sp. PI. XXI, fig. 20. 



Stat. 267. 5° 54 Lat. S., 132° 56.7 Long. E. East off Kei Islands. Depth 984 M. 2 specimens. 



Two specimens of Polynoc, not well enough preserved, to make a satisfactory description 

 possible. They measure nearly 1.4 mm. in length, whereas the number of segments is about 

 45. The head is somewhat broader than long, rounded trapezoidal, with a broad median dorsal 

 groove, but without frontal peaks. There are two pairs of Jarge eyes, the anterior situated on 

 the lateral prominences of the head, the posterior pair on a short distance. The lateral 

 antennae are short, not half as long as the head, conical, tapering distally ; the tentacle is 

 absent. The palps are .stout, abruptly terminating with a filiform tip, about twice as long as 

 the head. Only a single scale was left; it is elliptical, with a smooth margin and a reticular 



1) Loc. cit. p. 252. 



2) Siboga-expediue, vol. XIII, Die Goigoniden: Primnoidae, p. 25. 



3) Liigisca iniians, ein Symbiont von Hydvokorallen ; Bulletin Museum Conip. Zool. Harvaid College Vol. XLIII, 1904. 



61 



