REPORT ON THE ANNELIDA. 
355 
A fragment of the anterior region, comprising about thirty-six segments. No eyes 
are visible. 
All the bristles are smooth, except the stout forms on the anterior segments, which 
show faint transverse markings near the tip. In the same somites a series of long 
forms with peculiarly bent acuminate tips occur. These appear to take the place of the 
transversely barred bristles in Aricia. The stouter bristles are also remarkable for their 
long acuminate extremities. In the long and peculiar curved bristles, e.g., from the 
tenth foot (PI. XXIIa. fig. 18), the tip is generally incomplete. Such would seem to 
lead on to the bristles met with in Scoloplos. 
The disproportion between the dorsal and ventral muscles is still evident in this 
form, the first mentioned being thick externally in section and somewhat pointed 
internally, while the ventral are deepest in the middle, and slightly diminished at each 
end. Both are perforated by vertical plates of muscle. The oblique muscles are of 
moderate bulk and spread over the nerve-area. The latter forms a comparatively large 
flattened ovoid mass beneath the thin basement-tissue of the region, and presents traces 
of two small neural canals superiorly. Externally (ventrally) is the thick hypodermic layer, 
which is specially increased in bulk in the central region, so that the nerve-cords are 
placed at a distance from the surface. The hypoderm is thinner on the dorsal arch, but 
is much developed laterally. The alimentary canal has a somewhat thin wall, and is 
attached by muscular fibres to the median line dorsally and ventrally, the pedicle in each 
case being comparatively short. In the preparations the tract forms a narrow vertical 
chamber, the external region having a very slight muscular development. 
Scoloplos, (Blainville) CErsted. 
Scoloplos. kerguelensis n. sp. (PI. XLIII. figs. 6-8 ; PI. XXIIa. fig. 19). 
Habitat. — Dredged at Station 149 g (off London River, Kerguelen), January 29, 1874 ; 
lat. 48° 50' S., long. 69° 18' E. ; depth, 110 fathoms, — in company with various other 
Annelids and a Caprdla. A fragment was also obtained off Christmas Harbour, in 
the neighbourhood; depth, 120 fathoms; surface temperature, 40°'2 ; sea-bottom, 
volcanic mud. 
The specimens are fragmentary, ranging from 10 to 20 mm., and having a diameter of 
rather less than 2 mm. 
The snout (PI. XLIII. fig. 6) is less pointed than in Scoloplos armiger, and one of 
the examples shows a transverse group of brown pigment-granules a little in front of the 
posterior border of the first segment. The special bristle-bearing region anteriorly is 
much shorter than in the common form, while the bristle-tufts are longer. There are 
