REPORT ON THE ANNELIDA. 
875 
Station 233 a, January 19, 1875; lat. 34° 38' N., long. 135° 1' E. ; depth, 50 fathoms; 
surface temperature, 62°‘6 ; sea-bottom, sand. 
When removed from its tube the body of the animal jiresents anteriorly (PI. XLVI. 
fig. 1) an enlarged truncate snout, grooved on the dorsal and somewhat truncate on the 
ventral surface. The anterior margin has the form of the equine hoof, the hollow looking 
upward, and marked just within the rim by a brownish band. Dorsally the elongated 
tentacles arise behind the sides of the hoof, and stretch outward to a very great length, 
some of the organs in the spirit-preparation measuring 50 or 60 mm., and of course being 
capable of much greater extension in life. A very distinct double madder-brown band 
runs along the ventral margin of each organ (probably in the groove) from base to tip, 
and must increase the beauty of the mobile structures in activity. They are slightly 
narrowed at the base, and still more toward the tip. A little above the insertion of each 
is a short clavate tentacle. 
As in the latter species the first region of the body includes, besides the snout, nine 
segments. It is somewhat concave on the dorsal, convex on the ventral surface. An 
elevated central fillet with a double brown band occurs on the dorsal surface, while the 
ventral is variegated by pale brownish pigment in front, and, as in Spiochcetopterus 
typicus by a large pure white shield-shaped patch, stretching from the sixth to the ninth 
bristle-bundle, and covering the sides as well as the ventral surface proper. The contrast 
is further intensified by a broad blackish or dark olive belt immediately in front. The 
white pigment is peculiarly pure and effective, resembling a dense coat of Chinese white. 
In some specimens a faint belt of a delicate fawn colour surrounds the shield. 
In general structure the bristles of this region correspond with those of Spiochce- 
topterus typicus. The first three feet have dorsal pads, bearing rows of bristles just 
within the margin. The first series consists of bristles with tips formed of expanded 
wings, somewhat halbert-shaped (PI. XXIVa. fig. 1) in profile, and spear-shaped (fig. 2) 
Avhen viewed antero-posteriorly, though it is rare to get a perfectly symmetrical outline. 
At the third series the extremities are widened, and the fourth are still more robust both 
in shaft and tip. Moreover, in the middle of the series are one or two of the strong 
brown spines (PI. XXIVa. fig. 3), which when seen by transmitted light, as in the figure, 
presents no distant resemblance to the structure of certain dental tissues. Each is a hard, 
brittle, hollow organ with a broad bevelled tip (slightly scooped out) like the crown of a 
worn tooth, and a little pressure splits it longitudinally into halves. The bristles of the 
fifth series, again, have stouter shafts and broader tips (PI. XXIVa. fig. 4) and are 
altogether larger, as indicated by the proportions of the drawing just mentioned in 
contrast with figs. 1 and 2. 
The middle region of the body consists of two segments, which appear to agree in 
structure with those of the typical form. 
