DASYCHONE ARGUS. — Bi 
organs almost baffle description. The general effect of the branchial coloration is striking 
(Plate CXII, fig. 6), for three broad reddish-brown belts cross the branchiz, the most intense 
being inferior; thereafter the colours tone down to the white collar. Two white belts separate 
the three brown bands, and various white touches enliven the beautiful fan. Dalyell’s were 
variegated with different shades of brown and yellow, and he mentions one with snow-white 
plumes located inside an old oyster-shell. 
The pigmented tentacles or palpi (Plate CX XI, fig. 1a) are large organs, tapered from 
base to apex, and with a deep groove which in the spirit-preparations is directed dorsally, 
but which in the living and expanded condition of the parts may be directed inward. The 
groove is deeply tinted with brown pigment. Their bases are fused to the basal region of 
- the branchiee, and to the central mass, and they are shed with them, and probably perform 
important functions in directing currents to the alimentary canal. 
The body (Plate CXII, fig. 6) is moderately elongated, but in contraction almost elliptical, — 
and attains a length of three quarters to two inches, and has fifty-eight well-marked segments, 
of which five to seven are anterior. It is rounded on the dorsal surface, and devoid of any 
anterior groove, slightly flattened ventrally, and with a median groove from the posterior 
border of the ninth bristled segment to the tail, where the terminal anus has two small lateral 
papille. The ventral surface from the collar backward has in each segment a glandular scute. 
These occupy the middle of the anterior region. The long rows of hooks occur at the sides and 
they continue of similar breadth to the posterior end. After the ninth, the ventral glandular 
shields are split in the mid-ventral line by the groove, and in some a faint line runs from the 
collar along the middle of the anterior segments. The body is of a madder-brown or dull 
red (orpiment-orange, Dalyell) colour in some with white specks both dorsally and ventrally. 
In others it is dull orange with only a few whitish grains on the collar; or of a light orange 
hue—rendered dark here and there by the intestine. The lobes of the collar are speckled 
with minute dots of white, and two white papillee occur at the anus, or a white patch in front 
of it. Young examples between tide-marks in Guernsey and Herm are yellowish green, 
with the dark speck at each foot. A bold dark brown speck occurs at the ventral edge of 
each setigerous process in the anterior region, the uncinigerous ridge commencing behind it. 
At the ninth bristled segment a smaller speck is situated rather behind the setigerous process 
dorsally, and at the commencement of the uncinigerous row, and so to the posterior end of 
the annelid. In one from Malahide the collar had many minute brown specks. The alimen- 
tary canal commences at the mouth as a wide though translucent membranous tube marked 
by transverse strie. About the middle of the body it becomes narrower and thicker with 
powerful and rather coarse transverse fibres and more delicate longitudinal muscles. The 
dissepiments fix the canal in every segment, and thus it assumes a moniliform aspect, or 
occasionally resembles a coiled spring. 
The first setigerous processes are nearer each other than the succeeding since the line 
of the bristles anteriorly trends dorsally. The conical first 1s smaller than the second, and 
bears a series of bristles with more slender winged tips (Plate CX XIX, figs. 1 and 1’) than 
the succeeding. A typical tuft in the anterior region (Plate CX XIX, fig. 1a) presents dorsal 
bristles with more elongated striated shafts, and short, tapering winged tips. The shaft 
shehtly tapers toward the wings and again toward the insertion. Those at the edge of the 
series (Plate CX XIX, fig. 1’’) have somewhat broader wings, which are striated and serrated 
