EEPORT ON THE ANNELIDA. 
507 
The cephalic collar commences at the base of each branchial fan near the middle 
line, trends outward to the sides of the body, and bends downward to the centre 
ventrally to terminate in the reflected lappets, a slight marginal notch occurring just 
before the curve downward. 
The branchiae form two rather elongated fans, barred at short intervals (at the 
ocular spots) vdth brown bands. The radioles are slender and the pinnae long. 
The latter somewhat diminish in length toward the tip, but the terminal ones are 
ong enough to envelop the filiform tips of the radioles in the preparations. The basal 
external appendages of the radioles are rather long and spathulate (PI. XXXIXa. 
fig. 8), but become more slender as well as much shorter toward the filamentous tip, 
at the base of which the last pair occur. These processes somewhat resemble those 
of G-rube’s Sabella {Dasychone) polyzonos^ from the Island of Lussin in the Adriatic. 
The lateral ocular spots are in the brown pigment-band, a little beyond (distal to) each 
pair of external appendages. The axis of the radiole presents the usual division by 
transverse septa into spaces. 
The tentacles are of moderate length, bayonet-shaped and grooved. They seem to 
be longer in immature specimens. 
The thoracic or anterior region has eight segments. The bristles in each tuft 
present well-marked groups. The dorsal (PI. XXXIa. fig. 9) bear elongated tips and 
narrow wings ; the inferior (PI. XXXIa. fig. 10) have broader wings and shorter 
extremities ; moreover, the wings are not so distinctly separated from the axial portion. 
Both possess very evident crenations at the margin. The posterior bristles again show 
very finely tapered extremities attached to the region with broad wings. 
The anterior hooks (PL XXXIa. fig. 11) present about six or seven very distinct 
teeth above the great fang. A somewhat wide sinus exists below the latter, for the 
prow is moderately developed. The posterior basal process is curved slightly downward 
and truncated. The convexity behind the crown is well-marked, and the dorsal line is 
continuously arched. In the posterior hooks the neck is more elongate. 
The intestinal masses are composed of fine mud containing fragments of sponge- 
spicules and Radiolarians, Diatoms, Coccoliths, and Coccospheres, fragments of 
Foraminifera, an anomalous four-rayed body with transverse markings, and another of a 
circular form with concentric radii. 
No tube is present, but as the species was dredged in green sand, the tube may 
have been brittle or the protection only a hole in the sand. 
The structure of the body-wall agrees with that in Dasychone violacea, the only 
noteworthy dilference being the presence of a median fissure in the ventral pad. 
1 Beschreibung neuer oder weiiig bekaDiiter AmieL, Archiv f. Naturgesch., 1863, p. 63 (sep. Abd.), Taf. vi. 
