102 
THE VOYAGE OF H.M.S. CHALLENGER. 
The complete state of the head enables the description formerly given to be supple- 
mented. The tentacle is a long slightly brownish process, having just below the tip a 
darker brown band. The enlargement below the extremity both in this and the cirri — 
which have the same colour — is so slight that it could hardly be recognised. These 
processes have sparsely distributed short clavate cilia. The brownish palpi are of average 
length and quite smooth. 
In this specimen the scales are very thin, but they present no trace of the 
gelatiniform conditions observed in those of Halosydna gelatmosa, Sars. The colour of 
the scale is faintly brownish, with a pale border externally, and a lighter spot toward 
the point of attachment. The brownish pigment is best seen on the under surface of the 
scale. The somewhat circular first scale has a pale border all round and a pale patch 
in the centre. The right (first) scale is superior. 
The ventral papilla is well marked as a prominent cylindrical process on the 
fifth bristled foot. In some a small soft mass projected from the tip as if a granular 
substance had exuded. The process extends farther outward than usual on the foot. 
The ventral area is of considerable length, and the nerve-cords much flattened. The 
cuticle separates very readily from the hypoderm. 
Allmaniella} n. gen. 
Allmaniella setubalensis, n. sp. (PL XIV. fig. 2; PL Xa. figs. 3, 4). 
Habitat. — Procured by the dredge at Station II. (off Setubal), January 13, 1873; 
lat. 38° 10' N., long. 9° 14' W. ; depth, 470 fathoms; surface temperature 57°'0 ; 
green mud. 
The anterior fragment of a minute species measuring about 3 mm. in length. The 
breadth from tip to tip of the ventral bristles is about the same. It is characterised 
by its large eyes, peculiar shape of the head, and the remarkable structure of the 
ventral bristles, which show bifid points terminally, and then some distance beneath 
another distinct point inaugurates the spinous rows. The dorsum is reddish-brown, and 
the ventral surface is of the same hue but somewhat paler. 
The shape of the head (PL XIY. fig. 2) is peculiar, since the tentacle lies nearly in 
the centre, and from this a furrow is continued backward to the neck. The head is thus 
divided into two well-marked lobes. Only the basal region of the tentacle is present. 
Two large eyes are situated on the dorsal aspect of the head posteriorly, and wide apart. 
Each has a central white speck. Two others occupy a lateral position opposite the 
tentacle. The latter are much larger, and also have a central whitish area. The head 
1 The genus is named in honour of Prof. Allman, F.E.S. 
