ONITPHIS FRAGOSA. 415 



deep water, one having these on every foot, whilst in others they range from the sixth to 

 the eighth backward. 



The first foot has dorsal and ventral cirri and a rather longer and larger median 

 process behind the setigerons lobe. A few slender spines go to the base of the dorsal 

 cirrus, whilst the setigerons lobe bears a tuft of rather strong bristles with slender, 

 minutely-hooked tips, probably bifid, but the preparation is indistinct on this head. 

 The wings are prolonged to a filamentous process at the tip, and occasionally they 

 separate. 



At the tenth foot simple winged bristles occur, and two stout bifid hooks (Plate 

 LXXV, fig. 8, ninth foot), the shaft being enlarged in the middle and convex forward, 

 then sloping gently backward to the neck. The main fang is very strong, its inferior 

 edge forming more than a right angle with the shaft, and a strong tooth curved slightly 

 forward projects from the crown. The twentieth foot presents similar bristles and 

 hooks, and, in addition, three spines of varying size, but with the tips prolonged as 

 filiform processes. The brush-shaped bristles of the upper division offer no peculiarity. 



The posterior feet agree for the most part with the last-mentioned, each having 

 three spines with the filiform tips, two long hooks, and a tuft of bristles with narrow 

 wings. 



The tube is composed internally of a delicate hyaline secretion coated either with 

 sticky mud or greyish muddy sand, and it is rather friable. 



This is one of the many discoveries made by M. Sars (1871) in the Norwegian 

 waters, and described from his manuscripts after his death by his talented son. It 

 apparently haunts the deeper waters up to 300 fathoms off Lofoten, and to a greater 

 depth off the British shores. 



5. Onuphis fragosa, Ehlers, 1887. Plate LXIV, figs. 3-3 b— head, teeth, tube ; Plate 

 LXXV, figs. 9 and 9 a— feet; Plate LXXXIV, figs. 6-6 b— bristles. 



Specific Characters. — Head comparatively small, with slender tentacles of moderate 

 length, the median being shorter than the adjoining lateral, and all the posterior tentacles 

 having long, ringed cirrophores. The anterior form rounded bosses. Body somewhat 

 rounded in front, flattened throughout the rest of its extent. First segment narrower 

 than the succeeding, and carries the comparatively short, subulate tentacular cirri at its 

 anterior border. Proboscis, yellowish with dark touches. Maxillge strongly curved 

 anteriorly and acute. A dark band between them and the posterior appendages, which 

 are spathulate, with a notch at the end. Eight great dental plate has nine teeth ; left has 

 nine. Azygos plate nine. The left anterior curved plate has eight, the right nine or ten. 

 The mandibles are small in front with narrow tips in the centre, then a band of pigment, 

 and laterally the sloped petaloid blade. First foot bears a series of translucent bristles 

 with pseudo-articulations at the tips, which are minutely bifid and furnished with 

 long pointed wings. A few simple bristles with tapering tips (without evident wings) 

 occur dorsally. The feet decrease in prominence from the first to the fifth, and thereafter 

 they still further diminish. The dorsal cirrus after the first six or seven becomes very 



