PELAGOBIA SERRATA. 437 
bristles borne by the setigerous process have straight shafts, a bifid spur with a longer and 
a shorter sharp process and a serrated terminal process with the spikes directed distally. 
He describes a dorsal vessel as in Pontodora in ripe examples, which had either ova or sperms. 
The alimentary canal has a muscular pharynx with a glandular (?) central region. He was 
uncertain as to the position of the species, but thought 1t might be near the Syllids. 
Viguier! (1886) found the same form in the Bay of Algiers from December onward 
throughout the year. He points out that the mouth is not terminal, but on the inferior 
surface of the head, behind the ventral pair of tentacles, a ciliated furrow passing in front 
of the inferior tentacles, and terminating superiorly in front of the dorsal tentacles. The 
groove separating the prostomium is also ciliated. He shows that the antero-posteriorly 
elongated eyes rest on the cephalic ganglia, which are bar-like from transverse extension. 
The nuchal organs form two lateral ciliated processes on each side between the first foot 
and a point opposite the eye. The proboscis has a series of parallel longitudinal glands, 
with enlarged or bulbous ends posteriorly in the centre of the organ, and when the latter 
is extended these bulbous ends are distal, the tip of the organ having a smooth border. He 
describes and figures the pygidium as a short cone with a minute process in the centre, and 
a circle of cilia a little in front. The foot has a spine and a group of bristles, the tip of 
the shaft being bevelled, and a serrated terminal blade articulated with it. The generative 
elements fill the coelom, and even pass forward into the sides of the proboscis in extrusion. 
He considers that the form belongs to the Phyllodocide. The figures of this author are 
excellent, and in contrast with those of Reibisch, who, however, had only preserved materials. 
Much larger and older examples were procured by the Prince of Monaco at 2300 m. off 
the Gulf of Juan, and at 4800 m. off Portugal, the latter of a bright reddish orange, and 
apparently having over twenty setigerous segments. According to HKhlers, the Pelagobia 
vigueert of Gravier represents an older stage of Greef’s P. longicirrata. It would appear that 
the older stages frequent deep water. 
Reibisch (1895) gave an account of the development of what he considered to be the 
same species (P. longicirrata) as Greef’s, though slight differences are apparent. He figures 
the eggs and the young without tentacles, but with two eyes, two feet and two anal cirri, 
and various stages up to the longest with twenty-four segments, and considers that it 
approaches the young of Hteone. Its distribution is almost cosmopolitan. 
In general outline the early stages of Pelagobia somewhat resemble the larval stages of 
Spherodorum, but differ in certain details, such as the median cephalic and caudal processes 
and the papilla on the body, whilst the bristles seem to be proportionally longer. 
Pelagobia is extensively distributed abroad—chiefly in the warmer seas of both hemi- 
spheres, yet it occurs in the waters of Greenland and ranges through the intermediate area 
to the South Pacific, and appears at various seasons. 
PELAGOBIA SERRATA, Southern, 1909. 
Specific Characters—Head rounded in front, apparently devoid of eyes. 
All the specimens were imperfect, but generally agreed with the outline of P. longi- 
! “Arch. Zool. Expér.,’ 2° sér., t. iv, p. 377, pl. xxi, figs. 1—13. 
