REPORT ON THE ANNELIDA. 
189 
and little removed from a transverse line. The outer pair, however, are somewhat 
anterior as well as very much larger than the inner ; and while the latter are round, the 
former are ovoid. The anterior border of the snout is slightly notched, and just behind 
the latter is a slender median tentacle. On each side is another tentacle having an 
enlarged base and a segmented tapering tip. The next organs consist of two tentacular 
cirri, the dorsal being similar in shape to the pair in front, only somewhat larger and 
longer, the ventral shorter and more slender. The posterior situation of the eyes, the 
notch of the snout anteriorly, and its linear continuation backward, would seem to indicate 
some relationship to the soldered lobes of Sphcerosyllis. Moreover, the aspect of the 
pharyngeal region and of the proventriculus is Syllidian, though the latter organ appears 
to be transversely ridged rather than papillose. 
The foot behind the tentacular cirri is setigerous. Dorsally each foot (PI. XXXIII. 
fig. 1) bears a cirrus of moderafe length, slightly narrowed at the base, then widening 
and finally tapering to a filiform tip. The state of the preparation is indifferent, but 
anteriorly the distal region of each cirrus is distinctly segmented. The setigerous region 
is obliquely conical. The chief spine occupies the usual position in the Syllidae. Above 
the spine is a single simple bristle (PL XVa. fig. 11) with a slightly bent tip which is 
acutely tapered. The bristles beneath (PI. XYa. fig. 12, one of the superior) have 
elongated sabre-shaped terminal pieces, the point being simply hooked. The ventral 
cirrus is a simple subulate process which reaches somewhat beyond the tip of the seti- 
gerous region. 
This form approaches that group of the Hesionidse in which Gyptis ^ and Ophio- 
dromus ^ are placed, the biramous foot showing superiorly a very rudimentary branch. 
In Salvatoria herguelensis the latter has only a single simjDle bristle. The body some- 
what resembles that of the Syllidae in length. 
Family Syllida:. 
The Syllidae of the Expedition are not very numerous, being only eleven in number, 
but one of the most remarkable animals procured by the Challenger occurs in the group, 
viz., Syllis ramosa, a form which throws off lateral buds so readily as almost to form a 
meshwork of living tissue, these buds being branches of the parent-stock, and having 
their alimentary canals connected with that of the original portion. Moreover, sexual 
buds are also produced at various points in the same manner. 
Prof. Grube describes fifteen species from the Philippines, ranged under four genera, 
viz., Syllis, Odontosyllis, Autolytus, and Platysyllis, whereas- the eleven Challenger 
1 Marion et Bobretzky, Ann. d. Sci. Nat., ser. 6, t. ii. p. 50. 
^ Sars, Oversigt o. d. K. D. Vid. Selsk. Forhandl., 1861, pp. 87, 88. 
