152 Prof. M‘Intosh’s Notes from the 
there are two strong bifid hooks. The branchiz cease about 
the 31st foot. 
The posterior feet project little, forming smoothly rounded 
processes with simple attenuate dorsal bristles and two strong 
bifid hooks beneath. Only a single tail in process of repro- 
duction was present, and it bore a single cirrus; but on this 
no reliance can be placed. Sars describes four anal cirri— 
two long superior and two shorter inferior cirri. 
This species approaches so closely the Diopatra socialis * 
of Ehlers from the ‘ Porcupine, that, though Ehlers shows 
a strong bifid hook with the shorter prong broken (thus 
comparison is difficult), I am inclined to agree with Grube in 
uniting them. It shows also certain relationships to the 
Onuphis eremita, Aud. & Edwards, though in the latter the 
branchiz arise on the 2nd foot. 
In the bottle was a firm tube of reddish mud, lined by a 
tough mucous secretion, but it was empty. It probably was 
that inhabited by the species. 
The bifid, or, as he calls them, bicuspid capillary bristles 
of the three anterior segments mentioned by Sars + have not 
been observed, but what he refers to is in all probability 
the tips of the tapering guards or wings of the special bristles _ 
shown in fig. 35, Pl. XIII. 
This species is probably the Nothria opalina of Prof. 
Verrill ft. 
None of the American species described by Ehlers seem to 
approach this form, for if the bristles are similar the 
branchiz are absent, and vice versa. 
The third species, which may be the Onuphis holobranchia 
of Marenzeller, appears to approach Onuphis Grubei, Maren- 
zeller, a form which comes near Nothria tenuisetis of the 
‘Challenger,’ especially in the structure of the bristles, though 
there are certain differences, such as the origin of the 
branchiz. It was dredged between Cape Rosier and Cape 
de Gatté, in 70 to 80 fathoms, amongst stones, in 1872, and 
in 100 to 212 fathoms off Anticosti, in the Gulf of St. Law- 
rence, in 1871 and 1873. 
The head is characterized by the great length of the ten- 
tacles, the median, however, being shorter than the adjoining 
long posterior lateral. The anterior or short external lateral 
are, on the other hand, thick, with a marked distal filament, 
which is abruptly narrowed. This tentacle, moreover, is 
* Zeit. f. w. Zool. Bd. xxv. p. 46, Taf. ii. figs. 5-10. 
t+ Op. cit. pl. xv. figs. 16, b, ¢. 
{ Amer. Journ, Sci. & Arts, y., Feb. 1878, p. 102. 
