174 Scientific Proceedings, Royal Dublin Society. 
and chisel-shaped; ventral setee compound, the appendage with 
two hooks; acicles two anteriorly, but posteriorly sometimes as 
many as five (three dorsal and two ventral). Branchiz beginning 
on the ninth segment (seventh parapodia), with one, two, or three 
filaments, present on all the following segments, until very near the 
posterior extremity of the body, but with never more than four 
filaments, which are from a quarter to half the length of the dorsal 
cirri, and arranged in a small comb. Two anal cirri. Maxillee 
with six teeth each side, or with only five on the left; unpaired 
Sageplatte with six teeth, paired with four on the left side, eight 
on the right. 
No. of segments, 110-152; length, 120-190 mm.; breadth, 
65-8 mm.; length of each of first three segments, 0-3-1 mm. ;: 
length of following segments, 1:3-1:8 mm. ; 
Tubes of a parchment-like consistency, with jagged lateral 
openings. Found inhabiting colonies of Lophohelia prolifera,, 
dredged at a depth of 200 fathoms, fifty miles off Bolus Head, 
Kerry. 
The various points are illustrated, and some of the individual 
differences shown in the figures, Pls. 1x. & x., figs. 2-8. The figure on 
Pl. x1. shows the relation between the worm and the coral. Appa- 
rently the worm is commensal on the coral, and to some extent 
modifies its growth, the coral growing round the worm-tube which 
thus becomes embedded in the coonenchyme. I have often seen 
parts of colonies of Lophohelia prolifera with hollow tubular cavities. 
similar to those we have here, and it seems very probable that 
they are likewise due to the presence of worms, although, as far as 
I know, no worm has as yet been described as taking up its 
abode in this particular coral. It would be interesting to know 
the nature of the worm, if present, inhabiting colonies from other 
localities. With regard to the one before us, I may call special 
attention to one specimen (Pl. 1x., fig. 4), in which there are two. 
tentacular cirri on the right side in the second segment, instead of 
one (the left tentacular cirrus happens to be broken rather near 
its base in this specimen). Instances of such duplication, or even 
12 Other worms have been described on other corals; and different crustaceans, as is: 
well known, frequently cause modifications in the growth of coral. The subject is 
dealt with by Semper in his ‘‘ Natural Conditions of Existence as they affect Animal 
Life.’’ 
