424 LEPIDASTHENIA ARGUS. 
leavmg the centre of the dorsum bare, occuring on segments 1, 3, 4, 6,8 . . . 20, 22, 
25,28 . . . 79, 82, etc. They are smooth, pellucid, iridescent, brownish, with a stellate 
arrangement of the nerves, and decreasing in size posteriorly. The foot is bifid at the tip, 
a long, pointed papilla being in front, and a less acute process behind. Dorsal division 
represented only by a papilla with an included spine and a cirrus internally. Ventral division 
bearing chiefly bifid spinous bristles, the upper series being either more robust or with 
longer tips. Ventral cirrus smooth, but a row of papille may occur between it and the 
nephridial aperture. Two anal cirri. 
LEPIDASTHENIA ARGUS, Hodgson, 1900. Plate CXXXIV, figs. 1 and 1g’—body, proboscis, 
scale and bristles. 
Specific Characters.—Cephalic region with brown pigment posteriorly. Median tentacle 
rather long, enlarged near the filiform tip; lateral tentacles more slender and the swelling 
indistinct ; tentacular cirri similar to the lateral tentacles ; all are smooth and have a dark 
pigment-band at the distal part of the enlargement, which is marked by a belt of opaque 
white. Body elongate (84 inches) and with upwards of 200 segments, little tapered anteriorly, 
but more distinctly so posteriorly, where a cirrus occurs on each side of the anus. Proboscis 
firm, cylindrical, with about twelve papille on each margin, and two horny teeth above 
and below, alternating when locked. Colour of various shades of brown, sometimes with 
a purplish hue; a transverse bar of dark brown at each segment-junction. The cirrus- 
bearing segments have a diffuse patch of the same pigment. Ventral surface pale with 
a median line of red. Seales sub-circular or in a few reniform, smooth on margin and surface, 
with a fan-shaped patch of brown pigment, the narrow end anterior, whilst near the posterior 
margin is a crescentic band of opaque white. 
Feet with vertically bifid setigerous processes, the tip of the anterior being the longer 
and more distinctly conical. Dorsally is either a cirrus, which is smooth and filiform without 
enlargement below the tip, or a scale-process, whilst ventrally is a short cirrus. The dorsal 
division is represented by a distinct papilla into which the spine goes, and in some (posterior) 
by a few simple bristles. Ventral bristles in three groups, viz. an upper with long, slender 
shafts and elongated spinous tips, a median and more numerous group with stouter shafts 
and shorter tips, and an inferior series more slender than the median and with short spinous | 
tips. The tips of the bristles are in most bifid. 
SYNONYMS. 
1900. Lepidastheia argus, Hodgson. Journ. M. B. A., vol. vi, p. 250. 
1915. ne  —— ong WOll, 3% Jo GIB, 
1921. McIntosh. Ann. Nat. Hist., ser. 9, vol. viii, p. 292. 
” 3) 
Habitat.—Salcombe, in the tubes of Amphitrite Hdwardsi (Todd); Plymouth (Hodgson). 
The cephalic region (Plate CX XXIV, figs. 1 and 1a) is reddish, with a median longi- 
tudinal groove. The median tentacle is long, stout, enlarged near the filiform tip ; lateral 
tentacles more slender and the swelling indistinct. Tentacular cirri similar to the lateral 
tentacles. All the foregoing are smooth with a dark band at the distal part of the enlarge- 
