82 
THE VOYAGE OF H.M.S. CHALLENGER. 
had neither palpi nor tentacular cirri. The Polynoe antarctica of Kinberg/ from the 
same region, differs in the structure of the scales, cirri, and bristles. 
Lagisca magellanica, n. sp. (PL XIII. fig. 5 ; PI. XVIII. figs. 3, 4 ; PI. VIIa. 
figs. 1, 2). 
Habitat. — Procured by the trawl at Station 308 (Strait of Magellan), January 5, 
1876; lat. 50° 8' 30" S., long. 74° 41^ W.; depth, 175 fathoms; surface temperature, 
51°‘7 ; blue mud. 
Also from Station 149h (off Christmas Harbour, Kerguelen), January 29 1874 ; lat. 
48° 45' S., long. 69° 14' E. ; depth, 127 fathoms; surface temperature, 39°’0; volcanic 
mud. 
The largest example (from Station 308) measures 32 mm. in length, and with the 
bristles is 10 mm. in diameter. 
In some the dorsum is tinted light brown, but the ventral surface in all is pale. 
The head is somewhat broad and large, and furnished with four conspicuous eyes, two 
of which are situated at the posterior border and wide apart, and two (the larger) on the 
lateral prominence (PL XIII. fig. 5). This arrangement of the eyes seems to be common 
in Lagisca. The head and the basal division of the tentacle are quite pale. The distal 
portion of the latter is equally pallid, nearly cylindrical, or with very slight enlargement 
below the filiform tip. The antennse and tentacular cirri are also pale and conform to the 
same structure ; moreover, all these processes are covered with moderately long clavate 
papillae. The palpi are pale, and under a high power quite smooth, only the fine 
crenations of the contracted cuticle and hypoderm being visible. The ventral cirrus is 
quite smooth ; and the ventral papdla, though less developed in this genus than in 
Lepidonotus, is fairly prominent, and directed posteriorly between the feet. 
The scales appear to be fifteen pairs, though none of the examples is complete. 
The first is rounded and covered with a dense series of small spines, while round the 
free border are numerous cilia which are slightly clavate and somewhat short (PL XVIII. 
fig. 3). The surface of attachment presents in this and all the others a narrow brownish 
ring. A first scale had apparently two umbilici, but the origin of the second mark is 
uncertain. The first scales are either pale or flecked with brownish grains. The suc- 
ceeding are marked with similar grains, and in some also have a very distinct brown 
pigment-patch in the centre. If the latter be well developed the accessory grains are 
few or absent ; whereas when the grains are abundant the central area is rather an 
aggregation of grains than a well-marked pigment -patch. The scales are delicate and 
translucent, the anterior having a slightly pinkish or skin hue, and the eyes are seen 
through them. The only opaque parts are the spines (PL XVIII. fig. 4). The latter 
1 0]p. cit., p. 23. 
