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THE VOYAGE OF H.M.S. CHALLENGEE. 
as large round cords. The muscular and other arrangements seem to conform to the 
ordinary type. 
A Polynoe with similar large and nearly connate eyes, which, however, are arranged 
longitudinally rather than transversely, is described by Panceri^ under the name of 
Plioloe hrevicornis ; but the species clearly diverges from Pholoe in essential structure, 
indeed, is apparently allied to the Hermadion jpellucidum of Ehlers. The absence of the 
dorsal tentacles may have been accidental. The species approaches Alentia. 
Polynoe (Admetella) longipedata, n. sp. (PI. XIV. fig. 5 ; PI. XX. fig. 6 ; PI. XIIa. 
fig. 17).. 
Habitat. — Two examples were dredged at Station 146 (to the east of Prince Edward 
Island), December 29, 1873; lat. 46° 46' S., long. 45° 31' E. ; depth, 1375 fathoms; 
bottom temperature, 1°’5 C. ; Globigerina ooze. 
The larger specimen (a female) measures about 65 mm. in length and 20 mm. across 
the widest part of the body and the fleshy part of the feet, or 30 mm. inclusive of the 
bristles. 
The body is somewhat fusiform in outline, being rather more tapered anteriorly 
than posteriorly. It is pale and soft, and the great length of both feet and bristles is 
characteristic. There are upwards of sixty segments in the one and fifty in the other. 
The head (PL XIV. fig. 5) is comparatively small, totally devoid of eyes, and its 
limited area much encroached on by its processes. It is wide in front and narrow 
behind. A prominence on each side posteriorly resembles an ocular region, but there is 
no trace of pigment, nor any indication of its having been a pale eye. The tentacle is 
absent, but judging from the large area occupied by its base in the middle of the head, 
it seems to have been of considerable size. From the front of the base outward on each 
side is attached a thin flattened process, broad at its origin and tapering to a blunt tip. It 
thus lies above the antennae, and apparently is homologous with the scale at the base of 
the tentacle in the Sigalionidse. This is the only example in which such a process has 
occurred in the Polynoidse, and its presence is therefore both suggestive and important. 
The antennae are somewhat small and filiform, their delicate tips extending only a short 
distance beyond the ends of the former j)rocesses. The palpi are both large and long, 
and taper from base to apex. They are smooth, and their margins show only very fine 
crenations from contraction. The tentacular and dorsal cirri are very long (though shorter 
than the palpi), smooth, and somewhat translucent, with a slight enlargement below the 
attenuate tip. The ventral cirrus is filiform and comparatively short (not reaching the tip of 
the setigerous region). It springs from the middle of the free portion of the foot. In the 
^ La Luce e gli organi luminosi di alcimi annelidi. Atti Accad. Sci. Napoli, t. vii. p. 16, Tab. iii. figs. 13-15, and 
Tab. iv. figs. 6-8, Napoli, 1875. 
