52 
its proper habitat must be a furrow similar to those of the 
Tubicnlous worms, to which in structure it evidently approximates 
in several particulars. ” 
Dr, J ohnston’s description is wanting in detail in some respects, 
and Prof. McIntosh, in the Annals and Magazine of Natural 
History, vol. 2, series^l868, p. 282, gives a very lengthy descrip- 
tion of the tentacles, bristles, hooks and the anal segment, 
accompanied by a plate, which is reproduced and will be found 
at the end of this report. As far as I can ascertain, nothing has 
yet been published in reference to the egg s of the worm, and the 
following, if new, may be of interest : — The ova appear to be 
matured in the body of the worm and commence on about the 
thirtieth segment. Each succeeding segment to about the fiftieth 
bears a pair of egg-sacs, each of which contains between fifty 
and sixty eggs. The egg-cases are deposited on the sides 
of the membranous tubes inhabited by the worm, and remain 
in this position until the young worms are hatched. (Fig- 10, 
plate 3). It appears to me that the brood-pouches are formed 
within the body of the worm, and at the period of deposition 
the outer cuticle is ruptured, and the egg-sacs fixed on the 
sides of the tube. Before the eggs are deposited, the body 
of the worm is plump and of a cream colour, with a central 
line varying in colour from bright red to a very dark brown. 
Afterwards the body appears thin and of a chocolate colour, 
and appears almost like another species. In fact until I 
carefully examined those which had laid their eggs, I thought 
there was a second species inhabiting the oysters. The period 
during which the worms produce ova may be stated to be the 
months of October, November and December. IIow far the 
breeding extends beyond these months I am unable to say ; but 
it probably is within the mark to say that it may extend for a 
month or six weeks on each side. 
The following is a list of the principal writers who have written 
on the worm and its habits : — 
Leucodore ciliatus — Johnston, Magazine of Zoology and Botany, 
1838, ii., p. 66, pi. 3, f. 1-6. 
,, ,, Dr. T. Williams, Report of the British Asso- 
ciation, 1851, p. 208. 
,, „ Dr. Johnston, Catalogue of Non-Parasitical 
Worms in the British Museum, 1865, p. 
205, pi. 18, f. 6. 
„ „ Prof. E. Ray Lankester, Annals and Maga- 
zine of Natural History, 1868, vol. 1, 
ser. 4, p. 233, pi. xi. 
,, „ Prof. W. C. McIntosh, Annals and Magazine 
of Natural History, vol. 2, ser. 4, 1868, 
p. 276, pis. xviii. and xix. 
