178 Scientific Proceedinys, Royal Dublin Society. 
body ; filaments varying individually in length and not necessarily 
equal in number on both sides of the body (16-19), richly barbed 
on the ventral side, but with very few, only two, or sometimes 
three, very short barbs on the dorsal side, and with no ocular spots. 
Prostomial tentacles lanceolate, one-third length of branchie. 
Change of sete 8/9. Capillary sete of thorax of two kinds. Dark 
spots between the sete and tori extending nearly to the posterior 
end of the body through about the first thirty segments. On 
each ventral shield on either side of the middle line through the 
same segments there is also a dark spot.” 
Number of segments, about 45. Length (without branchie) 
about 10 mm.; branchiz, 6 mm.; breadth, 1:5 mm. 
Tubes of closely adhering mud and fine sand. Locality, 50 
miles off Bolus Head, 200 fathoms, ‘‘ coral’ bottom. 
The specimen is not very complete, and I have had to ‘‘ restore” 
it somewhat in figuring it. A peculiarity in my specimen is that 
the posterior end is bifid (Pl. x., fig. 10), but the anus apparently is 
between the two prongs, not as in Claparéde’s specimen of Salma- 
cina incrustans,”> also double. 
Tam not sure in how far I am justified in associating this with 
Johnston’s species,”* but think it will be less confusing than making 
a new species for a single and not quite complete specimen. 
Fam.—TEREBELLIDA. 
The tube of a Terebella, which is probably the 7. flabellum of 
Baird” and M‘Intosh** was dredged 40 miles off Achill Head at a 
depth of 220 fathoms. 
single row of avicular uncini, everywhere of the same form. Branchie forming a semi- 
circle somewhat convoluted at the base on each side, apex of each filament naked, short 
and subulate, bases connected to form a membrane, dorsal appendages to branchial 
filaments present, but short, arranged in pairs; ocular spots on the branchie in some 
species, not in others. A black spot on each side of the body between each torus and 
bundle of capillary set. 
24 The same thing occurs, judging from some Naples specimens, in D. ducuilan, 
Sars and D. Ch. 
ees Claparede,”” Ann. (Ohoet. Bt-pi1,) pal 71, plex centro ee 
26 Johnston’s type specimen, as Malmgren has already observed, has now got no 
branchiz, and would be very difficult to diagnose. 
*7 Baird, Journ. Linn. Soc., vii., p. 157, pl. v., figs. 1 and 2. 
*8 M‘Intosh, ‘‘ Challenger Report,”’ p. 447, pl. 1., fig. 1. 
