53 
Leucodore ciliatus — Prof. T. H. Huxley, The English Illustrated 
Magazine, No. 1, Oct. 1883, pp. 46 to 55 ; 
No. 2, Nov. 1883, pp. 112 to 121. 
„ ,, Dr. W. A. Haswell, Centennial Magazine, 
Sept. 1889, p. 148. 
Polydora (Leucodore) ciliata (Johnston) — Alexr. Agassiz, Annals 
and Magazine of Natural History, vol. xix, ser. 3, 1867, p, 
242, pis. v. and vi. 
Polydora ( Leucodore) ciliata — Dr. W. A. Haswell, Proceedings 
of the Linnsean Society of New South Wales, vol. x, p. 273. 
There are very many other papers bearing on the habits of the 
worm, amongst which may be mentioned one by Dr. Wright in 
the Edinburgh New Philosophical Journal, 1857, vol vi, p. 90; 
another by Mr. Alexander Oliver in the Centennial Magazine for 
September, 1889, pp. 134 to 148 ; and some details of the habits 
of the worm are given by Sir J. Dalyell in his work on the Powers 
of the Creator Displayed in Creation, 1851, vol. ii, p. 159. 
■: 0 :~ 
SUPPLEMENTARY NOTE. 
Since the foregoing was written, T have received a number of 
oysters through the Department of Fisheries, from the Clarence 
River, which had been in fresh-water for 13 days, owing to the 
Hood waters spreading over the beds. An examination of these 
oysters tends to confirm the opinion already expressed in the 
body of this report. 
Out of 200 oysters, 50 were found to have been attacked by 
the worm, and 25 of these exhibited the early stages of the 
disease. The area occupied by the worms was of variable extent, 
but mostly small ; the patches of mud being covered by deposits 
formed by the oysters ; 15 out of the 25 specimens were in the 
membranous stage, and in the rest the deposits were partially 
calcified. In the whole of the 50 specimens the position occupied 
by the worms was on the anterior margin of the shell, about mid- 
way between the hinge and the ventral edge. On clearing away 
the patches of mud, which were covered with membrane only, the 
surface on which the body of the worm rested was found to be 
perfectly smooth, and without any trace of erosion ; whilst in 
those in which the deposited layers were thick and fully calcified, 
slight traces of grooves were visible near the margin. In every 
