276 
THE VOYAGE OF H.M.S. CHALLENGEE. 
The dorsal cirrus does not show distinct annulations. The foot bears in front two 
pale spines, and in the posterior region of the body, in addition, a strong curved 
hook (PL XXIa. fig. 11) with three teeth, viz., a main fang and two smaller processes 
above it. It differs from that in Eunice bassensis in having the latter more prominent, 
but such may be due to differences in age. Eunice liinosa, Ehlers, has a similar eleva- 
tion of these terminal hooks. 
The dorsal bristles present no peculiarity. The compound forms (PI. XXIa. fig. 10) 
have a stoutish, slightly curved shaft, without distinct striae in the dilated part at the 
tip, though the margins of the latter are serrated. The distal region has a widely 
bifid extremity. 
In transverse section the oblique muscles form a strong plate over the nerve-area. 
The nerve-cords are comparatively large, and the neural canal is normal in position. At 
the bases of the feet, and on each side of the alimentary canal inferiorly are cellulo- 
granular masses, probably connected with reproduction. The cuticle is dense. The 
longitudinal dorsal muscles form a comparatively uniform arch superiorly, only a little 
enlargement occurring at the inferior margin of each. The ventral longitudinal muscles 
are ovoid in section. 
Eunice vittata, Delle Chiaje, var.? (PI. XXXVIII. figs. 3, 4, 5 ; and PI. XIXa. figs. 
16. 17). 
Habitat. — Several specimens occurred between tide-marks at Bermuda in June 1873. 
The examples vary in size, the larger having a diameter of about 3 mm. 
The general aspect of the form resembles the European Eunice vittata, Delle Chiaje. 
The head (PI. XXXVIII. fig. 3), however, presents much more distinctly articulated 
tentacles. The frontal lobes are similarly separated only by a deep notch. The eyes are 
large, and show a pale lens-like centre. The tentacular cirri barely reach the anterior 
margin of the buccal segment. 
The dental apparatus in this form is curiously barred with brown and black pigment. 
The branchiae commence on the fifth foot and cease about the thirtieth. They have 
five divisions on the twentieth foot (PI. XXXVIII. fig. 4), in which the ventral cirrus is 
more tumid at the base than in the thirtieth (PL XXXVIII. fig. 5), though the divisions 
of the branchiae are the same. 
The setigerous region of the foot has yellowish spines. The tips of the jointed bristles 
(PL XIXa. fig. 16), while differing from the representation given by Prof. Ehlers,^ yet 
very closely approach the same parts in specimens of Eunice vittata from Guernsey. 
In the developing (or most complete) posterior hooks (PL XIXa. fig. 17) the crown is 
1 Op. cit, Taf. XV. fig. 18. 
