146 
THE VOYAGE OF H.M.S. CHALLENGER. 
The specimen, which is incomplete posteriorly, is much larger than the Zetlanclic 
form. The diameter of the latter, including the bristles, is 5 mm., whde this is fully 
7 mm. The great length of the bristles is conspicuous. 
In addition to the characters already noted, it may be mentioned that this example 
has two very distinct though not large eyes situated on the wide part of the head, a 
little behind the anterior margin. Moreover, a series of simple filamentous papiUse 
occurs at the base of the pinnate processes on the margin of the scales, and on the 
outer side they extend somewhat beyond them. 
The Sigalion edioardsU of Kinberg,^ procured in the Atlantic on a stony and sandy 
bottom off the mouth of the Eiver Plate, South America, is evidently a closely allied 
form, but the great divergence in regard to the structure of the scales prevents the 
identity of the two forms being established. Thus Kinberg shows a series of minute 
blunt spines or tubercles over the surface of the scale, and its outer margin has six or 
eight short, broad, pinnate processes, each of which has at most seven short blunt pinnae ; 
whereas Sigcdion hushii has a perfectly smooth scale, and often fifteen long pinnate 
processes on the margin of the scale. Each of the pinnae is lanceolate and granular, with 
a pointed tip, and instead of being only seven or eight, they are often more than double 
the number. Further investigation, therefore, of the scales and bristles of Kinberg’s 
form is necessary for the removal of doubt, a remark which is even more applicable to 
the Sigalion arenicola of Yerrill.^ 
The body -wall has a thick cuticular coat, but the hypoderm is thin, even m the 
nerve -area. The cords are flattened. The outer edge of the ventral longitudinal 
muscle forms in section a short lobe. The proboscis has the typical structure, with a ridge 
internally at each pole. The elastic arrangement externally at the latter is well developed. 
Psammolyce, Kinberg. 
Psammolyce occidentalis, n. sp. (PL XXII. figs. 5 ; PI. XXIII. figs. 2, 3 ; 
PI. XXVII. fig. 6 ; PI. XIIIa. figs. 14, 15). 
Habitat. — Two fragmentary examples were dredged off Sombrero Island, West 
Indies, in from 450 to 390 fathoms ; sea-bottom, Pteropod ooze. 
In the larger specimen, which, including the bristles, measures 5 '5 mm. in diameter, 
the whole dorsum anteriorly is coated with whitish and pinkish Foraminifera, so that 
the anterior is very rough. The ventral surface of the body anteriorly appears downy, 
and the region behind minutely nodular, a feature due to the deposition of extremely fine 
calcareous ooze on the papillse, which agree in appearance with those on the scales. 
1 Freg. Eugen. Eesa, p. 30, Tab. ix. fig. 41, &c. 
2 Proc. U.S. Nat. Mus., vol. ii. p. 167 (fide Verrill), and Trans. Connect. Acad., pi. vi. fig. 5. I have not been able 
to consult the original description in the first mentioned. 
